I have a rabbit that is very healthy, and its poops all seem to be normal, no signs on diarrhea in the cage, but I just noticed that its bottom has is very poopy... thick. All my rabbits have been treated recently for their yearly preventatives... Revolution for mites, etc, Safeguard, for worms and e.cunniculi, etc. So, I am not sure what the poopy bottom (whatever you call it) is? Right now, I am doing the yearly Corrid preventative (cocci), but just started today, so that isn't causing it. Any thoughts? Thanks.