If your hamster had a bad clostridium or heliobacter infection in his Gastrointestinal tract it could cause copious diarrhea and an eventual rectal prolapse. A rectal prolapse occurs when the rectum actually falls out of the anus. After the rectum has been out of the body for a while it will dry out and become hardened.
A rectal prolapse is a medical emergency and requires surgical repair.
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