Others include common protein sources like beef, lamb, chicken, chicken eggs, and fish. (ipupster.com)
Chicken is the most common protein source found in commercial dog foods, but it's also the most common food allergen for dogs. (smartdogowners.com)
For most dogs and cats, that rules out chicken and beef, as these are the most common protein sources found in commercial pet food diets. (drrogerholisticvet.com)