I have a random rabbit around our farm and he gets into the fermented chicken feed... He also is offered his own feed, but Not sure how to stop him. I rarely see him, but I have caught him eating some of it not too long ago.I doubt it. Rabbits are a little like ruminants in the fact that they eat some of their undigested poop again~sort of like chewing a cud...they just don't regurg a cud like a cow or deer. I don't think they would need the fermentation and it would be very hard to feed them a wet feed. I would, however, use the mother vinegar in their water at all times and provide some good quality hay to balance their diet of grains.