Over the last few years, protein has become a major focus among dog owners, home feeders, and within the pet food industry. There is a growing belief that dogs need a high-protein diet and that the more protein a food contains, the healthier or more nutritious it must be.
But when it comes to protein, more isn't necessarily better—and the percentage printed on a pet food label tells us only part of the story.
Two diets can contain the same percentage of protein and provide very different nutritional value. This is because it isn't simply about how much protein is present. What also matters is the quality of that protein, the amino acids it provides, and how well the dog's body can digest, absorb, and use them.
Dogs Need Amino Acids, Not Ingredients
I don't know how many times I say this, but I think it is so important for dog owners to understand:
Animals need nutrients, not ingredients.
When it comes to protein, dogs don't have a nutritional requirement for chicken, beef, turkey or any other meat. Their bodies require amino acids, the building blocks of protein.
The ingredients we choose are the sources that provide those amino acids along with other nutrients. This distinction matters because evaluating a diet based solely on its ingredients—or even its total protein percentage—doesn't tell us how well it is actually meeting the dog's nutritional needs.
When a dog eats protein, digestive enzymes break it down into amino acids. These amino acids are then absorbed and used throughout the body to build and maintain muscle, skin, connective tissue, enzymes, hormones, antibodies and organs.
Protein Quality Matters
A protein percentage tells us how much protein is in the diet, but it doesn't tell us how well that protein will be digested or the amino acids it provides.
Protein quality depends on several factors, including digestibility, the amino acid profile and availability, processing, and the combination of protein sources used in the diet.
A highly digestible protein with a good balance of amino acids may provide more usable nutrition than simply feeding a larger amount of protein that is less digestible or doesn't provide the same balance of amino acids. What matters is not only how much protein goes into the bowl, but how well the dog can digest it, absorb the amino acids and use them.
Amino Acid Balance Matters
Dogs require specific essential amino acids from their diet. If one of those amino acids is too low, the body may not be able to use the others as effectively to build the proteins it needs.
Think of it like following a recipe. You can have more than enough of almost every ingredient, but if you're missing one important ingredient, adding more of everything else doesn't make up for what's missing.
The same applies to protein. Simply adding more protein doesn't necessarily make the diet better. What matters is whether the diet as a whole provides the essential amino acids the dog needs in the right amounts.
Dogs Don't Eat Percentages
When we look at protein in a diet, we can't just look at the percentage. Dogs eat a certain amount of food each day based largely on how many calories they need.
For example, two diets may both contain 30% protein, but if one is much higher in calories, the dog will need to eat less of it. This changes how much protein, and ultimately how many essential amino acids, the dog is actually getting each day.
This is why I prefer to look at protein in relation to calories, such as grams of protein per 1,000 kcal. It gives us a much better picture of how much protein the dog is actually receiving than looking at a percentage alone.
Is More Protein Better?
Not necessarily.
When I formulate diets for healthy dogs, I do like to see protein above the minimum requirements. But there is a difference between providing more than the minimum and simply adding more and more protein because we think more must be better.
What I am looking for is enough good-quality, digestible protein to provide the essential amino acids the dog needs. How much protein is appropriate will depend on the individual dog, including their age, activity level, whether they are still growing, their health and how many calories they are eating each day.
There are also situations where simply increasing protein may not be appropriate. Certain health conditions can change a dog's nutritional needs, which is another reason I don't believe there is one ideal protein percentage that applies to every dog.
Look Beyond the Number
Protein percentage is useful information, but it is only one part of evaluating a dog's diet. We also need to consider the quality and digestibility of the protein, the essential amino acids it provides, and how much protein the dog is actually consuming based on their calorie needs.
There isn't one protein percentage that is right for every dog. What matters is whether the diet as a whole is providing the right nutrients, in the right amounts, for the individual dog.
And this is why I always come back to the same principle: animals need nutrients, not ingredients.