Exactly, I have weaned puppies on raw green tripe. Adding raw meat whether it is beef, chicken, lamb, turkey, goat or venison is an excellent idea. I would avoid organ meats for puppies due to the high fat and vitamin content but the muscle meats are excellent. Raw eggs are also great. Beef hearts are another excellent addition. This time of year big pork shoulders are on sale so buy em cut them up and freeze them. Sometimes you can buy them in the fall for 25 cents a lb.
Given that most of the dry foods used are very low in animal protein, raw meat is a nice addition.
I am a little perplexed by some of the responses.