I noticed a black snake going in and out my shed at the base. My pet rabbit got injured in the back yard a few months ago and we don't know how. We had the emergency vet and our regular vet continually treat him. (maybe a snake bite} We still have him inside and he is much better. Would a black snake do this kind of damage? He couldn't even walk when we found him.
Not sure the size of the rabbit but it is possible that the black snake may be a (Rat Snake) some get over 7 feet long and it may have gave the rabbit a try..but that's strictly going by your info, the rabbit could have got himself caught on something as well.