Not at all. The complete balanced diet for a raw fed dog is based on a combination of protein sources, including muscle meat, bone, fat, and organ meats, achieved over time. If you wanted to do a complete balanced meal, it could, for instance, consist of beef heart, chicken gizzard, pork liver, goat rib, lamb tongue, chicken foot and mackerel. I have a number of customers who will have me mix organ meat from one animal, with the muscle and bone from another animal and mackerel, all ground and mixed together. There is nothing wrong with that.
Kathy