Hi everyone. We rescue Voodoo a few weeks ago and have him currently on antibiotics for a UTI. He has been seen by our vet several times but we just can't figure something out. He hisses when he poops, which I'm told could be constipation, but his stools look fine and he doesn't hiss when he pees. The vet said he's a healthy glider and his insides feel really good but we just can't figure out why he is hissing when he goes poop. Any thoughts?