The phrase "animal protein" refers to the type of protein that comes from animals. It is the protein found in foods like meat, fish, poultry, eggs, and dairy products. Full definition
These ingredients show excellent sources of animal protein in chicken (usually whole chicken) and chicken meal, as well as egg product. (dogfoodinsider.com)
Meat meal contains about 10 % moisture and is the most concentrated source of animal protein in dog food. (mysweetpuppy.net)
This does not mean that a balanced vegetarian diet is not possible, but we have decided to stick with quality animal protein sources for now. (diamondpet.com)