A pink or red tubular mass sticking out of your dog’s anus is most likely a rectal prolapse, a condition where one or more layers of the rectum push outward through the anal opening. It looks alarming, and it requires veterinary attention quickly, especially if the tissue is darkening in color or appears dry. While you wait to get your dog seen, keeping the exposed tissue clean and moist with saline can help prevent further damage.
What a Rectal Prolapse Looks Like
A rectal prolapse appears as a red or pink cylinder-shaped mass protruding from the area where your dog normally poops. It’s moist tissue that doesn’t belong on the outside of the body. In a fresh prolapse, the tissue is soft and inflamed but still a healthy pink or red color. If the prolapse has been present for hours or longer, the surface can darken, become crusty, ooze, or bleed.
Prolapses come in two forms. An incomplete prolapse means only the innermost layer of the rectum is bulging out, and it may look like a small doughnut of tissue around the anus. A complete prolapse involves all layers of the rectum pushing through, creating a longer, more obvious tube of tissue. Both need professional treatment.
Other Conditions That Look Similar
Not everything that protrudes near your dog’s rear end is a rectal prolapse. A couple of other possibilities can look confusingly similar.
- Anal gland abscess: Dogs have two small scent glands located on either side of the anus. When these become infected or abscessed, you may see painful swelling, discoloration, and sometimes an open wound where the abscess has ruptured through the skin. The key difference is location: an abscess appears to the side of the anus rather than protruding directly from it.
- Rectal polyp: These growths occur infrequently in dogs, but a polyp can periodically poke out through the anus. It tends to be a smaller, more localized mass rather than a tube of tissue, and its surface bleeds easily when touched. Larger polyps carry a higher chance of being cancerous.
A vet can distinguish between these conditions with a physical exam, so you don’t need to diagnose it yourself. What matters is recognizing that something abnormal is visible and getting your dog checked.
Why This Happens
Rectal prolapse is almost always caused by prolonged, intense straining. The rectum essentially gets pushed inside-out by repeated forceful contractions. The real question is what’s making your dog strain so hard, and that list is surprisingly long.
The most common culprit is inflammation of the colon or rectum. This includes colitis (inflammation of the large intestine), inflammatory bowel disease, and infections caused by intestinal parasites like whipworms or hookworms, or by bacteria like Clostridium or Campylobacter. Chronic diarrhea from any cause can create enough straining to push tissue out.
Constipation works the same way from the opposite direction. A dog struggling to pass hard, dry stool generates the same kind of abdominal pressure. Obstructions from foreign material, tumors, or strictures (narrowing of the rectum) can also force a dog to strain repeatedly with no relief.
Less obviously, urinary and reproductive problems can trigger it too. Bladder infections, bladder stones, and prostate issues in male dogs all cause straining that puts pressure on the rectum. Puppies are especially prone to prolapse because intestinal parasites are common in young dogs and their tissues are less firmly anchored.
What to Do Before the Vet Visit
Do not try to push the tissue back in yourself. Reducing a rectal prolapse typically requires sedation or anesthesia because the process is painful and your dog will resist, risking further injury. What you can do is keep the exposed tissue moist with saline (a simple saltwater solution) and prevent your dog from licking, biting, or dragging the area. An E-collar helps if you have one. Get to a vet as soon as possible.
The color of the tissue tells you how urgent the situation is. Pink or red tissue that’s still soft and moist is a good sign, meaning blood flow is intact. If the tissue has turned dark purple, black, or feels hard and dry, that indicates the tissue is dying. This is an emergency that needs immediate veterinary care, as dead tissue may need to be surgically removed.
How Vets Treat Rectal Prolapse
If the prolapsed tissue is still healthy, the vet will gently push it back into place under anesthesia, then place temporary stitches around the anus to hold it in position while it heals. These stitches are loose enough that your dog can still pass stool but tight enough to prevent the rectum from sliding back out. They stay in place for several days while the tissue reattaches.
When the tissue has been out too long and has died or sustained serious damage, it can’t simply be pushed back in. The vet will need to surgically remove the damaged section of rectum. This sounds dramatic, but dogs recover well from this procedure in most cases.
For dogs whose prolapse keeps coming back after the initial fix, a more involved surgery called a colopexy may be recommended. This procedure permanently attaches the colon to the inner abdominal wall, essentially anchoring it so it can’t slide out again. It’s reserved for cases where simpler approaches have failed.
Treating the Underlying Cause
Fixing the prolapse itself is only half the job. If the underlying reason your dog was straining isn’t addressed, the prolapse will likely come back. Your vet will look for the root cause, which might involve a fecal test for parasites, bloodwork, imaging, or a rectal exam to check for masses or narrowing.
If parasites are the problem, deworming resolves the straining quickly. For colitis or inflammatory bowel disease, dietary changes play a central role. A diet higher in fiber, using a combination of soluble and insoluble types, helps normalize stool consistency and reduces the urge to strain. Soluble fiber absorbs water and forms a gel that supports smoother colon movement, while insoluble fiber adds bulk and firms up loose stool. Probiotics or prebiotics can help some dogs as well. Dogs that don’t respond to fiber adjustments may benefit from a hydrolyzed or novel protein diet to address possible food sensitivities.
For constipation-related prolapse, increasing water intake, adding fiber, and in some cases using stool softeners can prevent future episodes. If a tumor, polyp, or structural problem is found, that will need its own specific treatment plan.