Rectal prolapse is the result of severe straining to pass stools. A portion of the colon (lower digestive tract) turns inside out and protrudes from the anus. This is similar to turning a sock inside out.
Although prolapse results from straining, many things can cause straining. These include diarrhea, constipation, intestinal parasites, swallowed objects, tumors, delivery of puppies or kittens, or disease of the prostate gland.
Rectal prolapse is treated by replacing the protruding portion of the digestive tract and eliminating the cause of straining. In some cases, surgery is necessary to correct the prolapse.