I recently got a rabbit from a pet store, poor little guy had been there for months and the cage was incredibly small. I've noticed his poops are smaller, almost black, and not a consistent size or (sometimes) shape. He has a vet appointment soon and I've tried to push hay on him and cut back pellets, made sure to give him a good amount of greens and reasonable treats he's only slightly interested in food as well. He seems mostly fine but I don't think they were feeding him properly there. I just want to see if there are any suggestions on getting his gut health back on track between now and his appointment.