Why Is There Mucus in My Dog's Stool?

Illustration showing the causes of mucus in dog stool

The Spruce / Madelyn Goodnight

Mucus on your dog's stool is not always cause for concern. Mucus can appear on dog poop naturally due to the lubrication of intestines. But if you're seeing it on a regular basis or large amounts are present, that can be a sign of a problem. Parasites, stress, or dietary issues are the common causes of mucus-y stool. Knowing more about what mucus in your dog's stool may mean can help you keep them healthy and regular.

Why Do Dogs Have Mucus in Their Stool?

Mucus can appear in a dog's stool naturally from the lubrication of the intestines. A small amount of mucus from time to time is completely normal as it allows feces to slide through the colon. If more mucus is seen in the stool on a regular basis, however, it can indicate an issue.

Too much mucus in the stool most often means there is excessive inflammation in your dog's colon and this condition is called colitis.

The colon is the last part of the intestinal tract that stool travels through before it exits a dog's body. When the colon becomes inflamed, colitis occurs and excessive mucus can coat your dog's stool.

The reasons for this inflammation of the colon include various intestinal parasites like whipworms and Giardia, stress, bacterial infections, like E. coli and Salmonella, ingestion of spoiled or contaminated food, inflammatory bowel disease (IBD), allergies, and trauma.

Diagnosing Why a Dog Has Mucus in Their Stool

Diagnostic tests will need to be run in order to see if the cause of the mucus in your dog's stool can be pinpointed. Your veterinarian will talk to you about any potential stressors and dietary indiscretion, and then start with some basic tests to rule out some common issues.

Microscopic fecal examination will screen for common intestinal parasites, while cytology and Giardia testing can look for less common parasites. If these tests are negative, and there is no indication of dietary indiscretion, stress, or trauma, more chronic reasons for the inflammation will be explored. Allergies and IBD can be more difficult to diagnose and may involve food elimination diets.

These various diagnostic tests will also ensure that what you are seeing is in fact mucus and not fat. Fat can look similar to mucus because it gives a greasy coating to the stool. But the reasons why a dog has fat in the stool are different than the reasons why it may have mucus. It may mean your dog is simply eating too much fat, or it could mean an issue with the gallbladder, pancreas, or other things.

Treatment of Mucus in Stool

The treatment for excessive mucus in your dog's stool will depend on the underlying reason for it. Parasites and infections may need to be treated with parasiticides and antibiotics. Probiotics and special diets may need to be consumed, and the inflammation in the intestines may need to be addressed with steroids. Your veterinarian may recommend supplementing fiber in your dog's diet to reduce inflammation and help stool pass more easily.

Some causes of mucus in the stool, like allergies and IBD, are chronic and will require ongoing management.

How to Prevent Mucus in a Dog's Stool

Since mucus in the stool can sometimes occur due to intestinal parasites, it is important to give your dog regular parasite prevention to decrease the likelihood of this issue occurring. These medications are often found in heartworm preventatives and are typically given monthly. Annual fecal examinations to check for parasites are also recommended and are often done when you bring your dog into the vet for its annual physical examination.

Probiotics and prebiotics can help facilitate a normal, healthy intestinal tract and therefore discourage infections and inflammation. Because of this, it may also be helpful to administer a mixture of these products, called a synbiotic, to your dog on a daily basis. These products come in various forms and flavors, and many are designed specifically for dogs. Some even contain other helpful ingredients like beta-glucans, vitamins, and more.

Finally, ensuring your dog doesn't eat contaminated or expired food and isn't living with chronic stress can help prevent mucus from occurring in its stool. These things aren't always easy, but being aware of the potential causes of excessive mucus in the stool can help you prevent it from happening in your dog.

  • What does mucus in dog poop look like?

    Mucus looks like slime or jelly, clear or pale, that surrounds the poop.

  • When should I take my dog to the vet for mucus in their poop?

    If you see more mucus than normal, if there's blood along with it, or if it's accompanied by diarrhea, these are times to call your veterinarian.

  • What can you feed a dog with mucus in their stool?

    If it's a very small amount of mucus, it's really nothing to worry about. If it's more, and the vet agrees your dog is fine, you can add some probiotics to your dog's food to see if that helps.