I have been feeding rabbit pellets and senior feed to my 25 year old quarter horse gelding for over 6 months now. He is fat and sleek again! He was a bag of bones. Honestly, I don't want him to gain any more, just maintain. I just have a little niggling worry about long term effects? He cannot chew the larger alfalfa pellets, although I stupidly did not think about soaking them for him. The first ingredient is alfalfa, but there are definitely other things in there. He seems fine. He is doing this heavy breathing thing that I don't like occasionally, and he acted like he was tying up or something when my 7 year old daughter rode him a few months ago. I don't know that they are related, however. Has anyone fed rabbit pellets in large amounts (probably 12 pounds a day) long term without problems?