I've been feeding RAW to Chato for about 3wks. His only protein source/bone source has been chicken backs. And for recreational fun it has been beef ribs. I believe he has fully adjusted to raw, and I would like to introduce him to another protein source. Maybe some ground beef? Or what other "raw meaty bone" would be good besides chicken backs? If I decide to go with ground beef, should I stick to extra lean? Or can I buy the big mama roll that is 80/20? Thanx?