The protrusion of the tissues surrounding the rectum is called anal prolapse. Sometimes there is a protrusion of some of the tissue during defecation and other times all of the tissue is outside of the rectum and visible even when the pet is not defecating. This condition can be caused by digestive disorders, urinary issues and genital system issues. Dogs and cats of any age can experience rectal prolapse.
When the tissues of the rectum are extruded beyond the anus and are visible, your pet will need to see a veterinarian. Even partial prolapse can be serious since the cause of the problem and any pain related to the prolapse need to be addressed.
There are many conditions that can cause this including parasitic issues in the intestines, straining to pass stools, diarrhea and inflammation of the small or large intestines. In some cases this is brought on during the birthing process. Problems with the bladder or prostate can also contribute to this disorder.
It is always best to see a veterinarian if your pet exhibits a prolapse of the rectum, is painful while defecating or the visible tissue is blue or black, indicating that the problem is chronic.