lexicon
“Vocabulary is a rich pasture of words.”
Homère
Bite inhibition
. Bite inhibition involves teaching your puppy to moderate the strength of his bite. When puppies play together, they learn together. When a puppy bites too hard, the other puppies scream to let him know that he has gone too far.
Vaccinate your puppy
Vaccination is intended to protect your dog from common and contagious diseases that could lead to death or irreversible damage to his health.
7 most common serious diseases: distemper, Rubarth’s hepatitis, parvovirosis, rabies, piroplasmosis, leptospirosis and kennel cough.
From the eighth week onwards, the mother’s antibodies no longer act on the puppy and the puppy is therefore no longer protected against disease. Therefore, the first injection of the vaccine should be given as early as seven weeks.
Vaccinations should be renewed frequently to ensure that your dog is protected throughout its life.
reference : vetostore.com-dog tips
Serious diseases
Serious diseases
Learn more about serious diseases – why vaccinate your dog?
Vaccination is only compulsory in very few cases in dogs in France. But just because it is not compulsory does not mean that it is not strongly recommended for certain diseases, to protect our animals. There are a number of diseases (viral, bacterial and parasitic) for which vaccines are considered essential in dogs in our regions such as: Parvovirus (P), Rubarth’s hepatitis (H), Canine distemper (C), Leptospirosis (L), Rabies (R).
All these diseases are relatively serious and potentially fatal in dogs. They are also quite contagious.
The other vaccines that exist for dogs are considered optional, as the diseases they protect against depend on the dog’s lifestyle. This is the case for the vaccine against kennel cough (Bordetella, Pi), piroplasmosis (Bab), leishmaniasis and Lyme disease (Ly).
Canine distemper
It is a highly contagious disease caused by a virus that affects several species of carnivores including dogs, wolves, foxes, lynx and ferrets. It preferentially affects young animals.
The dog is infected orally and nasally by contact with secretions contaminated with the virus. The virus attacks the body’s epithelium and thus causes various symptoms.
The best way to prevent the disease is through vaccination, which is very effective in dogs and ferrets. The primary vaccination consists of three injections at one month intervals in the puppy, followed by booster shots every three years in the adult dog.
Learn more? symptoms, treatment and prevention
reference : illicotveto.com-Dr Marion Tissier-veterinarian graduated from the National Veterinary School of Lyon.
Rubarth’s hepatitis
Rubarth’s hepatitis is mostly found in unvaccinated puppies under one year of age. This infectious disease is highly contagious. Even if it has become rare today.
This liver disease is caused by an adenovirus (CAV1) which is a small virus that is quite resistant in the external environment. The transmission mainly takes place as a result of :
-Contact with carrier dogs or foxes that act as a reservoir for the disease.
-External parasites (fleas, lice).
-The external environment contaminated by urine.
Vaccination is carried out from the age of 7 weeks (at the same time as for distemper) and consists of two injections one month apart. The recall is done every year or two.
Learn more? symptoms, treatment and prevention
reference : wanimoveto-Dr Bénédicte Hivin-veterinarian graduated from the National Veterinary School of Lyon
Parovidosis
The animals affected are mainly puppies and non-vaccinated adult dogs. It also affects more specifically dogs living, or having passed through, a community (puppy training courses, kennels, shelters, exhibitions, pet shops, etc.).
It is caused by canine parvovirus type 2, also known as CPV-2. This virus is very similar to the parvovirus that causes typhus in cats. It causes haemorrhagic gastroenteritis which can lead to the death of the animal in a few hours, in the case of the lightning forms, in a few days in the absence of appropriate emergency medical care. CPV-2 is a small virus, extremely resistant in the environment (several months) and resistant to many disinfectants, making it highly contagious.
Parvovirosis is the most common cause of puppy mortality in breeding, mainly during the weaning period.
The only real way to prevent parvovirosis is through vaccination! Vaccination against canine parvovirosis is one of the so-called essential vaccines for dogs of all ages and lifestyles. Since this vaccination was introduced in our country, the number of animals infected by this virus has decreased significantly.
Puppies born to properly vaccinated dams will gain immunity to parvovirus in their first week of life due to maternal antibodies transmitted through colostrum (the first milk). This immunity will gradually disappear in 6 and 16 weeks. Hence the importance of vaccinating your puppy as soon as possible, usually around 8 weeks of age.
The vaccination protocol against parvovirosis consists of three injections given to puppies at an interval of one month, followed by a booster when the animal is about one year old. Then the booster vaccination can only be done every 3 years.
Learn more? symptoms, treatment and prevention
reference : illicotveto.com-Dr Clément Leroy-Veterinarian graduated from the National Veterinary School of Toulouse.
Rabies
Rabies is a well-knownfatal disease. However, many owners wonder why vaccination against this disease is still recommended when it is no longer present in France today.
Rabies is an infectious disease caused by a virus that can affect all mammals including humans! It is a zoonosis, a disease that can be transmitted from animals to humans. Once the disease occurs, it leads to encephalitis (inflammation in the brain) which is always fatal. The virus is present in the saliva of infected mammals, such as cats and dogs. The virus is excreted in the saliva up to 15 days before the onset of symptoms. The disease is transmitted by biting, scratching or licking a wound or mucous membrane.
It is not compulsory to vaccinate your dog against rabies in France, except for dogs in so-called dangerous categories (law of January 1999).
The anti-rabies vaccination is compulsory when you wish to travel outside France with your dog (or cat and ferret).
Learn more? symptoms, treatment and prevention
reference : illicotveto.com-Dr Tatiana Pradel-veterinarian graduated from the National Veterinary School of Lyon (Vetagro Sup)
Piroplasmosis
Piroplasmosis, also known as canine babesiosis, is an infectious parasitic blood disease transmitted by ticks to dogs only.
It is caused by a protozoan parasite called Babesia canis. It is transmitted by the ticks Dermacentor reticulatus and Rhipicephalus sanguineus, which can be found in large forests as well as in cities (parks, gardens). The disease is more prevalent in certain parts of France, such as the south-west, the Massif Central and the eastern departments: this is where the most ticks carrying the parasite are found. The disease also has a seasonal character: sick animals tend to be presented in spring and autumn.
Piroplasmosis is a potentially very serious disease. It can lead to the death of the animal or cause kidney damage for example.
There is a vaccine against piroplasmosis in France: it is called Pirodog©. It can only be used from the age of 5 months. The primary vaccination protocol consists of two subcutaneous injections 3-4 weeks apart. Boosters should then be given every year or every 6 months depending on the lifestyle and risk to which the dog is exposed.
Learn more?
reference : illicotveto.com-Dr Tatiana Pradel-veterinarian graduated from the National Veterinary School of Lyon (Vetagro Sup)
Leptospirosis
Leptospirosis is an infectious bacterial disease caused by spirochetes of the genus Leptospira. It is also a zoonosis, a disease that can be transmitted from animals to humans. It is a disease that is found all over the world.
The bacteria of the genus Leptospira are divided into several serogroups that are genetically different. In France, the main serogroups identified are Leptospira Canicola, L. Icterohaemorrhagiae, L. Australis and L. Grippotyphosa. These bacteria are mainly found in water contaminated with wildlife (rodents, hedgehogs, etc.) but also in contaminated urine (dog urine). Dogs living in cities are just as much at risk as dogs living in the countryside.
In the most common form, the bacteria attack the kidneys, resulting in acute renal failure associated with fever, malaise, digestive problems and loss of appetite. Leptospirosis can also affect the liver and lungs.
Primary vaccination against leptospirosis in puppies consists of three injections at 2, 3 and 4 months of age. Only 2 injections are given if the leptospirosis vaccination is started at the age of 3 months (same for an adult dog that is no longer up to date with its vaccines). Then the first booster is given before the animal is one year old and the other booster shots every year.
Learn more?
reference : illicotveto.com-Dr Tatiana Pradel-veterinarian graduated from the National Veterinary School of Lyon (Vetagro Sup)
Kennel coughs
Kennel cough, also knownas canine infectious tracheobronchitis, is a highly contagious disease, mainly encountered in autumn and winter, which affects the respiratory system. It is mostly found in communities and places where dogs congregate
It is good to know that when you vaccinate your dog against the basic diseases, namely CHPPi (distemper, Rubarth’s hepatitis, Parvovirosis and Parainfluenza virus), you are already partially protecting against some of the pathogens that cause kennel cough.
-Parainfluenza virus is already included in standard vaccine mixtures, with annual boosters.
-When vaccinating against Rubarth’s Hepatitis, one is vaccinating against Canine Adenovirus Type I. There is cross-immunity with Canine Adenovirus Type II, which is frequently involved in kennel cough in dogs. That is, when vaccinated against Rubarth’s Hepatitis, the antibodies developed by the dog will also be effective against the other variant of the virus responsible for the respiratory disease.
For vaccines given by subcutaneous injection: dogs must be at least 4 weeks old; the primary vaccination consists of 2 injections spaced 2 to 3 weeks apart; protection lasts 1 year, so it is necessary to give a booster every year.
Learn more? symptoms, treatment and prevention
reference : illicotveto.com-Dr Tatiana Pradel-veterinarian graduated from the National Veterinary School of Lyon (Vetagro Sup)
Common spitz diseases
Common spitz diseases
reference : illicotveto.com-Dr Sarah André-veterinarian graduated from the National Veterinary School of Nantes.
Hyperuricosuria
Hyperuricosuria is an inherited genetic disorder that results in the formation of ammonium urate stones in the urinary system.
reference : illicotveto.com-Dr Laurie Bonnet-veterinarian graduated from the National Veterinary School of Nantes.
Persistent ductus arteriosus
Persistent ductus arteriosus is the most common congenital heart disease in the dog.
The ductus arteriosus is a small blood vessel that prevents blood from flowing into the immature, non-functioning lungs of the fetus. This vessel closes spontaneously a few days after birth, causing blood flow to be redirected to the lungs to take up oxygen.
In some puppies, this ductus arteriosus does not close properly. This disrupts the normal functioning of the heart and leads to heart failure which sets in after a few months.
Females are more at risk than males and a genetic component has been identified in some predisposed breeds.
Often the only symptom is the presence of a significant heart murmur, which is quite characteristic, sometimes associated with heart rhythm abnormalities. The puppy may also show stunted growth and abnormal fatigue, or more rarely cough and breathing difficulties.
The diagnosis is made by performing a cardiac ultrasound with Doppler to visualise the presence of the ductus arteriosus, but also to assess the consequences on the heart muscle and function.
The treatment of choice is surgical and consists of artificial ligation of this ductus arteriosus. This usually results in a permanent cure if the intervention is considered early enough, before the onset of irreversible heart failure. If this operation is contraindicated (risk of surgery, heart failure too advanced), a medical treatment can be prescribed to relieve the animal as much as possible. Unfortunately, without surgery, the prognosis is poor. Indeed, only 40% of puppies survive beyond 18 months.
If you have just acquired a puppy, it is therefore imperative to present it to your veterinarian for a clinical examination and to detect a possible heart murmur, for example during a vaccination consultation. The prognosis and chances of recovery depend directly on how early the diagnosis is made.
There is currently no genetic test to determine if your pet has the mutation that causes this disease.
reference : illicotveto.com-Dr Laurie Bonnet-veterinarian graduated from the National Veterinary School of Nantes.
Fallot’s tetralogy
Tetralogy of Fallot is an uncommon congenital heart disease in dogsand rarely seen in cats. This malformation results from abnormal embryonic development and combines :
- A narrowing in the diameter of the pulmonary artery (pulmonary stenosis),
- A hole in the septum that separates the two ventricles of the heart (ventricular septal defect),
- An anomaly in the position of the aorta,
- An increase in the size of the right ventricle by thickening of the heart muscle (hypertrophy).
The combination of these four abnormalities results in a poor supply of oxygen to the tissues (hypoxia). In order to compensate for this lack of oxygen, the body produces excessive red blood cells, which results in thickening of the blood and makes it more difficult to circulate through the blood vessels. This is known as blood hyperviscosity.
In puppies, the disease is usually expressed around 6 months of age. The lack of oxygenation causes a bluish coloration of the mucous membranes, called cyanosis, which is the most common symptom. The young animal may also show major fatigue on exertion, breathing difficulties or delayed growth.
During auscultation, the veterinarian often detects a heart murmur. This may be of varying intensity depending on the severity of the disease, or even non-existent.
Chest X-rays may show an increase in the volume of the right heart. It is the cardiac ultrasound that allows a diagnosis of certainty by direct observation of the anomalies mentioned above. A blood test may be taken to assess the amount of red blood cells.
The treatment of choice for Tetralogy of Fallot is surgical. It allows the correction of the 4 characteristic anomalies of the disease. However, this type of intervention is not very accessible in veterinary medicine, for reasons of technicality, cost and equipment.
A medical treatment of comfort can then be proposed and relies in particular on the realization of regular bleedings to decrease the viscosity of blood. The prognosis is quite variable depending on the severity of the malformations and associated complications. Unfortunately, the lifespan of animals with tetralogy of Fallot is short, with a median survival of 2 years, the risk of sudden death being quite high.
There is currently no genetic test for this disease.
reference : illicotveto.com-Dr Laurie Bonnet-veterinarian graduated from the National Veterinary School of Nantes.
Alopecia
reference : illicotveto.com-Dr Clément Leroy-veterinarian graduated from the National Veterinary School of Toulouse.
Deworming your dog
Deworming your dog is important to protect him from worms.
Internal parasites are a health risk for the dog. They can cause more serious problems, particularly in very young animals (stunted growth, weight loss, vomiting, diarrhoea, bloated stomach, loss of vitality, etc.).
They can also reach other vital organs such as the heart, lungs or eyes.
You should also treat your dog to protect the health of your family. Some worms can be transmitted to humans.
There are three types of dewormer for dogs: drinkable solution, tablets or injection treatment. Your vet will be able to advise you on the right type of dewormer for your dog.
It is advisable to deworm animals from the age of 2 weeks. Then at 4, 6 and 8 weeks, then once a month until 6 months of age. It is then recommended to deworm your dog 4 times a year.
reference : santédemonchien.fr
Learn more? : ESCCAP France is an association whose aim is to translate into French, adapt, disseminate and promote European recommendations for the diagnosis and treatment of parasitic and fungal diseases of pets and horses.
Antiparasitic
A dog that scratches very often and frantically may have fleas, lice, bedbugs, body mange or be allergic to dust, mites or pollen. If your dog scratches abnormally, do not hesitate to consult a veterinarian who will give him the appropriate treatment.
All those little bugs that try to bite him through his coat (like ticks, mosquitoes and sandflies) can transmit serious diseases.
Parasite prevention remains essential and should be maintained throughout the year to reduce the risk of infection and serious disease. Removal of planted ticks is essential, even if your pet is already protected by an external antiparasitic.
reference : santédemonchien.fr
Learn more? : ESCCAP France is an association whose aim is to translate into French, adapt, disseminate and promote European recommendations for the diagnosis and treatment of parasitic and fungal diseases of pets and horses.
The different types of education
Coercive method
or traditional method
The traditional method: Pavlovian conditioning
The coercive, or classical, method is based on responsive conditioning. Ivan Pavlov, a Russian physician and physiologist (1849-1936), developed this method of education.
The man, who fed his dog at the same time every day, realised that as mealtime approached, even before he brought the bowl near the dog, the dog started to salivate. He knew, in a way, that mealtime was approaching, and so he prepared his body accordingly. Pavlov soon realised that certain habits, such as fixed meal times, could lead to innate reflexes in the animal, such as the excessive salivation produced when food is eaten. What if, with other habits, the dog could acquire new reflexes?
To prove his theory, Pavlov then tested several sound stimuli at mealtime, including the famous jingle bell, by repeating them each time he brought food to his dog. After a while, the mere perception of the sound, without even bringing the bowl, made the animal salivate. He therefore concluded that learning, due to the combination of external stimuli and innate reflexes, could be possible.
Pavlovian conditioning, also called responsive conditioning or classical conditioning, means that the dog acquires reflexes involuntarily and automatically.
In the traditional method, the dog is conditioned by the use of painless aids such as collars, leashes and whistles, as well as rewards and sanctions.
Accessories are important, as they make it much easier for the animal to understand you. For example, if the dog pulls on its lead, it will get a bell (the owner also pulls on the lead). It is unpleasant, but it stops if it returns to the foot. Since escaping pain is a natural reflex, the dog quickly understands that if he wants to avoid pain, he must not pull on the leash.
The dog reacts rather than acts.
reference : chien.com-dog training methods
Positive method
The positive method: operant conditioning
Methods based on reinforcement or operant conditioning were developed in the 1950s by the American psychologist Burrhus Frederic Skinner (1904-1990).
According to him, Pavlov’s work on conditional reflexes had one major flaw: it did not take into account the environment after a response had been produced. In other words, it is because the dog knows that its action will be rewarded that as soon as the stimulus is heard, it does what is expected of it. To repeat Pavlov’s experiment, if the dog salivates at the sound of the bell, it is because it knows that it will be fed next. According to the American psychologist, if salivating had not been rewarded by the bowl the first time, once the stimulus had been heard, the dog would not have started salivating as soon as it heard the noise the following times.
With operant conditioning, or responsive conditioning, the order of the sequences is reversed in the learning phase: it is the behaviour that induces the order, rather than an order – or a stimulus – that induces a behaviour. The notion of the organist’s spontaneity is thus more present.
Of course, the aim is that, in the use phase of learning, the behaviour is caused by the command. But we are talking about a training method here, teaching a dog a new behaviour.
With the positive reinforcement method, the dog becomes an actor in its learning.
The dog acts rather than reacts.
reference : chien.com-dog training methods
Natural method
The natural method: learning without constraints
The natural education method was invented in the early 1980s. Joseph Ortega, a field ethnologist, was its creator.
It was after observing packs of wild wolves that his idea of unconstrained learning for education was born, which he later named the natural method.
He observed that in wild wolves, when the mother returns from hunting, she emits a signal, and the cubs immediately come running: to survive, they need to feed. The cubs do not take their eyes off their mother’s actions, reacting instinctively to the slightest of her movements: if she raises her head, the cubs lick their lips and sit down; if she lies down, they remain fixed on her lips and also lie down; if she walks, the cubs remain glued to her sides, their heads turned towards her. Their primary instincts guide their actions.
If we transpose this situation to a puppy and his owner, it is enough for the owner to have a treat or a dog toy between his fingers for the motivation to be the same, and for him to have the full attention of the little animal. He can then get him to do whatever he wants, such as sit by raising the treat or toy in the air, or walk by holding the reward against the animal’s muzzle. Here too, primitive instincts guide the puppy. And it is these innate tendencies that will drive the dog’s education. He learns without knowing.
Ortega’s method is based on many principles of modern ethnology:
- You must respect the dog, its personality, and use its natural behaviour without imposing many constraints. The master must also show empathy, and know how to put himself in the animal’s shoes, trying to think like him in order to understand his reactions (desires or reticence) and anticipate them.
- Innate tendencies: This category includes the use of food, play and dog toys, imitation, positive signals from the owner (praise, stroking, etc.), but also the use of situations that are pleasant for the dog (going for a walk, etc.).
- Use of motivation: If the dog wants to have something enjoyable, such as a treat or a favourite toy, it will be more motivated to learn. The stronger the motivation, the faster and more naturally the dog will learn.
The underlying idea is that there is no such thing as unmotivated action, either in humans or in animals. Motivation has nothing to do with intelligence or reason, but is based on an inner need, a strong desire, and is activated by a specific signal that will then mobilise the individual’s full attention and drive him or her to action, in order to fulfil the need. The natural method uses this powerful need in the dog to achieve the goals desired by the owner or trainer. - Cognitive learning is the learning and acquisition of awareness of events in the environment and the representation of an event or object through the dog’s intelligence and cognition. With the natural method, the handler trains the dog by posing simple problems that the dog must solve using all his senses, such as finding his toy under several cones.
The natural method proposes to start training well before the dog is six months or one year old, as is the norm in dog training clubs using the classical training method or the positive training method. As soon as the puppies are pre-weaned at the breeder’s, around the fourth week, the natural training method can be implemented. Indeed, it is at this age that the notion of motivation appears, as with the first bowls or toys and other play objects.
Around its seventh week, when its sensory receptors are most sensitive, the puppy memorizes references to the environment in which it lives, which it will use later on. As soon as the dog is adopted, the owner must therefore take over from the breeder to gently lay the foundations of its education.
In general, with the natural method, in one session, a two or three month old puppy is able to learn sit, down, recall and heel commands, all without a leash.
reference : chien.com-dog training methods
Music
Dogs have a high level of hearing acuity and sensitivity than we do. Their ears are therefore very well designed to appreciate music.
There is evidence that soft-sounding music, such as classical music, can have beneficial effects on dogs:
- Reduce anxiety in the distressed dog,
- Calming a hyperactive dog,
- Bringing joy to a depressed dog,
- To soothe the daily life of a very sick or temporarily ill dog,
- Enabling the dog to cope better with loneliness, for example when it is alone at home,
- To facilitate the education of dogs with behavioural problems.
These are just a few examples of the benefits of listening to music for dogs, but anyone can test their dog to see which style of music has the best effect on them.
In any case, it is safe to say that classical music (to which cats are totally insensitive) makes everyday life more pleasant for most canines. Like a natural tranquilizer, music soothes dogs, puts them in a state of zenitude and makes them happy as long as the music is well chosen and the volume remains moderate.
Some veterinary clinics play music in the waiting room or surgery room: it helps to soothe the animals and their owners!
A study was also carried out in a shelter by an American behaviourist: dogs are calmer when listening to music and therefore more adoptable than more agitated dogs. étude
reference : santevet.com-the music the sound and my dog
“Music gives a soul to our hearts and wings to our thoughts.”
Platon
Reverse sneezing
Eternuement inverse, which is translated as “reverse sneezing”, is a common phenomenon in dogs that can affect all breeds. It may seem impressive that your dog is making strange noises, but don’t panic!
It is caused by irritation of the nose and pharynx. It manifests itself as a seizure in which the dog inhales sharply through the nose and makes snoring-like noises.
During these reverse sneezing attacks, the dog extends its neck and is tense. It keeps its mouth closed and breathes in loudly several times, a bit like a pig making a noise.
It is in fact a mechanical reflex that is provoked by a sensation of irritation in the nose or pharynx in order to evacuate what is bothering it. It sounds like a cough, but instead of expelling into the nasal cavity like a normal sneeze, the dog sucks the secretions into the back of its mouth, hence the term “sneeze”. It can then swallow and thus remove these irritating elements.
Reverse Sneezing is a kind of reverse sneezing attack in dogs. It is safe for your pet. It can also occur when the dog is excited, eating, drinking or sniffing on walks.
When your dog has reverse sneezing episodes, you can try to stop it by blocking his nostrils for a second or two, but not for any longer!
You can also massage the throat to induce swallowing, but this requires some technique.
Usually, the crisis stops by itself. But it can be very useful to reassure your dog afterwards, who is distressed by this phenomenon, and by the noises he may have made.
Les crises de Reverse Sneezing sont occasionnelles et peuvent être causées par un corps étranger (poussière, pollen, etc), des vapeurs de produits toxiques ou encore des pathogènes irritants pour les muqueuses du chien (bactéries, virus).
Reverse sneezing in dogs can also be caused by a deviated septum, a malformation or an allergy. But in these cases, you will observe other symptoms such as panting, depression or fever. This is why, if Reverse Sneezing attacks are too frequent, it is best to consult your vet.
Learn more?
reference : santevet.com-Maryline Pattin
Sudoriparian gland
There are two kinds of sweat glands. The main role is to produce sweat.
Apocrine sweat glands are present in the anal and genital regions and in the armpits. They are always attached to a hair follicle, where their secretory duct ends. They are characterised by the evacuation of apocrine sweat, which they secrete, and of part of the cellular material, close to the terminal part of the gland’s excretory duct. Apocrine sweat, which is viscous and has a particular odour, has a poorly understood role in humans; in animals it contains pheromones, odorous substances that influence social and sexual behaviour.
Eccrine sweat glands, which are much more numerous than apocrine ones, predominate on the palms of the hands and soles of the feet. They have an excretory canal that opens on the surface of the skin through an opening, the pore. Eccrine sweat, rich in water and sodium chloride (salt), is involved in the regulation of body temperature: when the external temperature tends to rise, the vegetative nervous system controls the secretion of sweat, the evaporation of which causes heat loss; other factors, such as stress and certain pharmacodynamic agents (acetylcholine, adrenalin), can also trigger this secretion.
In humans these glands are distributed throughout the body and are very active in hot weather. The evaporation of sweat causes the skin to cool.
Both dogs and cats have sweat glands, but those on the body produce skin protection and pheromones. This is why it is said that dogs and cats do not sweat.
This, however, is not true, as both animals have sweat glands in their paws, between the pads. Both dogs and cats sweat from their paws, butthe surface area is so small that it does not cool the body.
reference: Larousse.fr
reference: conseil-veto.com – Dr Eric Trenel – Vétérinaire
Pheromones and hormones
Pheromones are chemical substances secreted by living organisms (animals or plants) that allow individuals of the same species to communicate with each other by smell, similar to hormones. As they move through the air, these substances carry real chemical messages that the animal or plant picks up from its environment. This innate method of communication, although little known, is crucial for many living beings, and more particularly for insects: it is thanks to pheromones that an ant will find its way back to its anthill and indicate to its congeners a source of food that it has found.
Pheromones were discovered in the 1960s. They were first discovered in insects, thanks to the work of a French entomologist named Jean-Henry Fabre. He succeeded in showing that the sex pheromone secretions of a female butterfly could attract males from a radius of 25 kilometres. Their existence in mammals was confirmed a little later, and it is now proven that pheromones exist in most animal species.
In mammals, pheromones are best known for their role in reproduction.
They generate a particular behaviour in the dog, which is also found in other species such as horses: flehmen. When a dog detects sexual pheromones, it curls its lips, opens its jaw and sucks in air with small tongue movements. This attitude serves to capture sex pheromones in a nerve organ located above the palate, the vomeronasal system. The pheromones are not directly captured by the olfactory system itself, but by this organ which then transmits them by nerve conduction to the olfactory bulb, the nerve centre of the dog’s sense of smell.
Depending on its physical and emotional state, the dog will emit different pheromones which will be received and decoded by its fellow dogs.
Thanks to advances in pheromone research, many other roles have been associated with them. Today, pheromones are seen as real business cards, allowing a significant amount of information to be given:
- they provide information on the physiological condition, gender and identity of the sender;
- they give information on the occupation of a territory, useful in the context of pack movements;
- If a dog makes a deposit under the influence of fear, the next dog will know it thanks to the pheromones, and will be aware of a possible danger;
- They allow a puppy to feel secure when placed in a new environment.
In the dog, the average age of puberty is estimated to be between 6 months and one year, whereas in its ancestor the wolf, puberty occurs at around 2 years. However, there are wide variations according to size and breed:
- Small breeds of dogs reach puberty between the 5th and 6th month;
- Medium-sized dogs reach puberty between the 6th and 10th month;
- In very large dogs, such as Great Danes, it may take up to 18 months.
Overall, there is little difference between males and females, who reach puberty at about the same age. In females, it is very often their weight that influences the age of puberty: they traditionally come into heat when they reach 80% of their adult weight.
reference : chien.com
Carl von Linné (Carl Linnaeus)
Carl von Linné (Carl Linnaeus)
Rashult, Sweden, 13/23 May 1707 – Uppsala, Sweden, 10 January 1778
“Alone with nature and you, I spend in my country walks delightful hours, and I derive more real profit from your Philosophia Botanica, than from all the books on morality. “This sentence, which Jean-Jacques Rousseau, a recent convert to botany, wrote to Carl von Linné in 1771, is that of a student to his teacher.
Linnaeus is the emblematic figure of European natural history in the 18th century. In 1735, this Swedish naturalist published the work that was to make him immortal: the Systema naturae. He sets out a rigorous classification of the three kingdoms of nature, which he divides into classes, orders, genera and species. His classification of plants, in particular, earned him worldwide fame. Linnaeus divided the plant kingdom into twenty-four classes according to the number of stamens and their position in relation to the pistil. The first class includes plants with only one stamen, the next those with two, and so on, with a few exceptions. The twenty-fourth class includes plants with no visible sexual organs, such as ferns or algae. To make his system clear, Linnaeus explains the scientific description of each of his classes with anthropomorphic metaphors that his detractors would denounce as ‘lewd’. With him, botany became a popular science.
The animal kingdom is divided by Linnaeus into six major classes. Man, studied as any other species, is placed by him in the class of “Quadrupeds”, within the order Anthropomorpha, together with the monkey and the sloth. Here again, many people, like La Mettrie, Buffon and Diderot, protested against this treatment of man. Linnaeus heard their criticism and, in the tenth edition of his Systema naturae, published in 1758, he substituted the name “Mammals” for “Quadrupeds” and named his anthropomorphs “Primates”. It was also in this tenth edition that Linnaeus generalised the use of a Latin binomial nomenclature to name each animal species: from then on, the human species was called Homo sapiens, the chimpanzee Pan troglodytes, the dog Canis familiaris, etc. Four years earlier, he had done the same for plants. The date of 1758 is now considered by the international scientific community as the starting point of modern zoological nomenclature. All newly discovered species continue to be named and described according to the principles laid down in the 18th century by Linnaeus.
Linnaeus’ world, however, has nothing in common with that of today’s biologists. God and the Bible are central to it. Linnaeus, a shepherd’s son, is convinced that he has been chosen by God to restore the order of creation. “Deus creavit, Linnaeus disposuit‘ is his motto. His contemporaries call him the ‘second Adam’. According to Linnaeus, the Earth was originally covered entirely by oceans, with the exception of one island below the equator: Paradise. Six thousand years ago, God created the plant and animal species there as it is
reported in the Genesis account, and then presented them to Adam to name. Since then, the waters have gradually receded, leaving habitable land that plants and animals have gradually colonised. The species living today, Linnaeus thought, are identical to those created by God at the origin of the world. None have disappeared, and no new species have appeared. Linnaeus is a creationist and a fixist.
Hailed throughout Europe and the world, Linnaeus’ classificatory and nomenclatural work, and the theological presuppositions that underlie it, have never been unanimously accepted in France. The botanists Bernard and Antoine-Laurent de Jussieu opposed the Linnaean sexual system with a more natural method of classification, based on the subordination of characters, which was adopted in the Jardin du Roi from 1774. Michel Adanson vehemently contests the interest of the binomial nomenclature. As for Georges-Louis Leclerc, Comte
de Buffon, steward of the King’s Garden for fifty years, he saw in the Linnaean enterprise little more than “scaffolding to arrive at science, and not science itself”. A view shared by Maupertuis and Diderot.
All the conditions therefore seemed to be met in France for Linnaean taxonomy to sink into oblivion after Linnaeus’ death in 1778. However, this was not the case. The first Linnaean Society was founded in Paris in December 1787, two months before the one in London, which is still active. In August 1790, a bust of the great man was inaugurated with great pomp in the Jardin du roi, under the cedar of Lebanon planted at the foot of the labyrinth. The revolutionaries were enthusiastic about the laconism of the new language with which he endowed botany and
zoology. With the cult of Rousseau, natural history became fashionable. Freedom trees, which must be chosen with care, are planted all over the country. The republican calendar becomes rural. Natural sciences are taught in the central schools that replaced the colleges of the Ancien Régime.
Thus a neo-Linneanism gradually emerged which, under the Restoration, found its most spectacular expression in the multiplication of Linnean societies: Bordeaux in 1818, Paris in 1821, Lyon in 1822, Caen in 1823, etc. The same thing happened elsewhere in the world: Philadelphia in 1806, Uppsala in 1807, Boston in 1813, etc. All these societies, which were open to women in France, celebrated a veritable cult of Linnaeus, particularly during learned country festivals, known as Linnaean festivals, whose ritual was carefully codified. The struggle they waged in the first half of the 19th century for a return to Linnaean dogmas, as set out for example in the Philosophia botanica (1751), so dear to J.-J. Rousseau, has long seemed anachronistic. However, it made it possible to realise the need to stabilise and harmonise scientific nomenclature. At the end of the 19th century, this was the work of the international codes of nomenclature which, even today, give absolute priority to Linnaeus’ writings. Until when? The current phylogenetic classification of living organisms is becoming increasingly difficult to reconcile with a nomenclature that was conceived some 250 years ago within a resolutely fixist framework. However, for the time being, no biologist has managed to propose a different classification that is unanimously accepted.
Pascal Duris
lecturer in epistemology and history of science at the University of Bordeaux 1
Source: Commemorations Collection 2007