The Puppy and the Dog They have been man’s companion through the ages and adapted to their owners, but they have their own behavioural and nutritional demands. Knowing and respectingthem will guarantee their health and well-being.

The cat’s feline nature is always a matter of fascination.He adapts with apparent ease to daily life, and yet he has behavioural and nutritional requirements of his own. Knowing them and respecting them will guarantee his well-being and his health.

Because of its composition, a Royal Canin Health Nutrition food provides all essential nutrients measured out with utmost precision in order to contribute every day and on a long-term basis to the well-being and health of every animal, according to his age, his size, his physiological condition and his breed.

Innovation for the sake of dogs and cats’ health. For over 40 years, Royal Canin has worked with breeder partners and veterinary nutritionists to go ever further into innovation and precision to enable us to formulate nutritional solutions which perfectly meet dogs and cats’ real needs.



Lysine is an essential amino acid for cats and dogs, which must be provided in the diet for the synthesis of all the proteins the body needs. Lysine deficiency in kittens and puppies for example slows down growth.

A little background information

Lysine is very sensitive to heat, which means that overly aggressive thermal treatments provoke a reaction with the sugars (Maillard reaction), which makes lysine unavailable to the body. Milk that is too warm for example causes a reaction between lysine and lactose. This particular sensitivity makes lysine a good tracer in the control of cooking of food.

Its role in the body

Besides its major role in protein synthesis, studies have shown the benefit of increasing dietary intake of lysine to combat the herpes virus in cats, which is one of the agents responsible for diseases of the upper respiratory tract, collectively termed feline rhinitis. The herpes virus generally provokes more serious clinical signs than other agents, especially in the eye. Kittens that have not been immunised may die as a result of infection. The supplementation of lysine limits the intensity of viral excretion and clinical signs in infected animals.

Natural sources

Lysine is abundant in animal proteins, especially meats and milk casein. Soy proteins also contain it in great quantities. There is however a risk that lysine will be missing from a cereal-based diet, which necessitates the supplementation of this amino acid.