Proteins in dogs: everything you need to know

When it comes to dog nutrition, one of the most discussed topics is undoubtedly protein. Are they really that important? Is there a difference between animal and plant proteins? And above all: which ones are best suited for a dog?

In recent years, the topic has become central not only among veterinary nutritionists and pet food companies, but also among owners who are increasingly attentive to the quality of the food chosen for their animals. However, a lot of confusing information circulates online, often based on simplifications or false myths.

Understanding what proteins really are, how they are used by a dog's body, and why their quality matters as much as their quantity is essential for making more informed dietary choices.

What are proteins

Proteins are fundamental macronutrients for all living beings. They are made up of chains of amino acids and represent one of the main components of the body.

In dogs, proteins participate in the formation of muscles, skin, hair, enzymes, hormones, antibodies, and tissues. In practice, they are involved in almost all biological processes.

Each protein is composed of amino acids, often called the "building blocks" of proteins. Some of these can be synthesized independently by the body, while others must necessarily be introduced through diet.

These latter are called essential amino acids.

Essential amino acids in dogs

Dogs need several essential amino acids, including:

• lysine
• methionine
• tryptophan
• leucine
• isoleucine
• valine
• phenylalanine
• threonine
• arginine
• histidine

If a food is deficient in even just one of these essential amino acids, protein synthesis can be compromised.

For this reason, not only the total quantity of proteins present in a food matters, but above all the biological quality of the protein source.

What are proteins for in dogs?

Proteins have numerous functions:

Muscle development and maintenance

They are essential for the growth of puppies and for maintaining muscle mass in adult dogs.

Enzyme and hormone production

Many digestive enzymes and hormones are made up of proteins.

Immune system

Antibodies are proteins. A poor or unbalanced diet can also affect the immune response.

Skin and coat health

Brittle hair, dry skin, or excessive shedding can also be linked to inadequate protein intake.

Physical recovery

Sporting or particularly active dogs need greater protein support for muscle recovery.

Difference between animal and plant proteins

One of the most debated topics concerns the difference between animal and plant proteins.

Animal proteins

Animal proteins come from meat, fish, eggs, or other animal tissues.

They generally possess:

• a more complete amino acid profile
• greater bioavailability
• often higher digestibility
• a high concentration of essential amino acids

For this reason, they are considered biologically more suitable for a dog's needs.

Plant proteins

Plant proteins come from legumes, cereals, soy, potatoes, or other plant ingredients.

They can still contribute to the total protein intake, but often have:

• less complete amino acid profiles
• lower concentration of some essential amino acids
• variable digestibility

This does not mean that they are useless or "bad," but simply that they must be evaluated in the context of the entire formulation.

Is the dog carnivorous?

From an evolutionary point of view, the dog derives from the wolf, but during domestication, it developed a greater ability to digest some carbohydrates compared to its ancestors.

However, the dog remains biologically oriented towards a diet rich in animal proteins.

Its digestive system, dentition, and amino acid metabolism still reflect a strong adaptation to the consumption of animal tissues.

Bioavailability and digestibility of proteins

Not all proteins are absorbed in the same way.

Bioavailability indicates how much a protein is actually usable by the body.

A highly bioavailable protein allows the dog to obtain more assimilable amino acids.

Digestibility is also important: a poorly digestible protein can increase intestinal load and produce more fermentation.

Complete and incomplete proteins

Complete proteins contain all essential amino acids in the right proportions.

Incomplete proteins, on the other hand, are deficient in one or more amino acids.

Many animal proteins are considered complete, while numerous plant sources must be combined to obtain a more balanced profile.

Are "high" proteins bad for the kidneys?

One of the most widespread false myths concerns the alleged kidney damage caused by proteins.

In healthy animals, there is no scientific evidence to show that a diet rich in quality protein causes kidney damage.

On the contrary, proteins are fundamental for maintaining lean mass, especially in older dogs.

Naturally, in subjects with specific kidney pathologies, nutritional management must be personalized by the veterinarian.

How much protein does a dog need?

Protein requirements vary based on:

• age
• physical activity
• physiological state
• health
• body composition

Puppies

Puppies need a high protein intake to support growth and development.

Adult dogs

A healthy adult dog needs enough protein to maintain muscle mass and metabolic functions.

Senior dogs

Contrary to what was previously thought, many senior dogs benefit from highly digestible and good quality proteins.

Sporting dogs

Dogs that engage in intense physical activity require a higher energy and protein intake.

How to read a food label

Many owners focus only on the total protein percentage, but correctly reading a label requires more attention.

You need to evaluate:

• protein origin
• main ingredients
• clarity of formulation
• presence of specific ingredients
• overall digestibility

A generic wording like "animal proteins" provides less information than specific and declared ingredients.

Proteins and homemade food

Even in homemade or BARF diets, protein management must be balanced.

An excess of muscle meat without proper supplementation can create nutritional imbalances.

For this reason, homemade diets should be developed together with a veterinary nutritionist.

The role of proteins in weight loss

Proteins help preserve lean mass during weight loss.

A weight-loss diet that is excessively low in protein risks also reducing muscle mass.

Proteins and intestinal health

A highly digestible protein tends to produce less intestinal fermentation.

Conversely, poorly digestible ingredients can increase fecal volume, intestinal gas, and digestive alterations.

FINALLY...

Proteins represent one of the most important elements in a dog's diet.

However, generally speaking of "high proteins" or "low proteins" is often reductive. The quality of the protein source, bioavailability, amino acid profile, and digestibility are fundamental aspects.

Animal proteins are generally more suitable for a dog's biological needs, but plant sources can also play a role within a balanced formulation.

The goal should not be to demonize or idolize a single ingredient, but to understand the overall nutritional value of the diet.

A balanced diet, correctly formulated and adapted to the individual needs of the dog, always represents the best choice for health, well-being, and quality of life.