15 Causes of Mucus in Dog’s Stool


Dog owners should sometimes take a closer look at their dog’s poop, so as to see some signs of illness.

They should not be surprised to see mucus or something similar to jelly, as mucus is actually very normal in a dog’s stool.

This is due to the fact that glands in the intestinal tract naturally produce mucus.

It is produced by the body so as to help keep the colon lubricated and moist to help the stools pass along.

Of course, the amount of mucus should not be extreme, being that excessive mucus accompanied by blood in the stool, diarrhea, vomiting, and/or other symptoms is a symptom of more serious issues.

As we have already said, inspecting your dog’s stool is obligatory, as that is the only way to see if there is anything unusual or alarming.

According to what you can see in the poop, you will know what your dog ate, whether it has parasites if it is stressed out or is suffering from a digestive disorder.

Mucus in your dog’s stool can appear due to various reasons, and we will speak about 15 main causes of mucus in the next paragraphs.

The mucus should become a concern when you notice the following:

  • There is an excessive amount
  • Blood is present
  • There is vomiting, diarrhea, lethargy, and/or loss of appetite

What Should Mucus Normally Look Like?

Mucus is often compared to a clear jelly-like substance mixed within the stool.

In certain situations, mucus appears as an envelope of the stool, like a sausage casing and there are cases when it is white.

Those dog owners who routinely inspect dog’s stools will immediately notice when something does not look like normal mucus.

Why Is There Blood in My Dog’s Stool?

In case there is blood in your dog’s stool, reasons can also be numerous.

Whether it is something serious or not, depends on your dog’s behavior.

A dog who is pooping blood, but is acting normal was probably experiencing a sudden change in diet, stress, food intolerance, or dietary indiscretion, and this should not be such a great concern.

On the other hand, there are serious causes of blood in dog stool including parvovirus, hemorrhagic gastroenteritis, and intestinal parasites, and they have to be diagnosed by a veterinarian.

Fresh and bright red blood derives from the colon or rectum, while a tarry stool is produced due to problems with the upper small intestine.

Blood followed by vomiting, chronic diarrhea, dehydration, and/or lethargy is a sign to call a vet immediately.

15 Causes of Mucus in Dog Poop

  1. Stress
  2. Dietary Indiscretion
  3. Food Intolerances
  4. Intoxication
  5. Diet Changes
  6. Inflammatory Bowel Disease (IBD)
  7. Crohn’s Disease
  8. Colitis
  9. Presence of Intestinal Parasites/Protozoans
  10. Fungal Infection
  11. Small Intestinal Bacterial Overgrowth (SIBO)
  12. Clostridial Enterotoxicosis
  13. Parvovirus
  14. Ingesting Foreign Objects
  15. Polyps and Tumors of the Intestinal Lining

What Does It Mean If There Is Mucus in Dog Stool?

If you notice an increased amount of mucus, you should know that this is a symptom of irritable bowel syndrome (IBS).

Being that it is an irritation, it can also be a possible inflammation of the colon or large intestine.

Actually, when irritation happens, the intestinal tract reacts to it by creating an extra layer of protective mucous lining.

In situations when your dog has irritable bowel syndrome, it will have the frequent urge to defecate and it will have semi-formed feces or runny stool with small amounts of bright, red blood, as well as excessive mucus.

The main 15 causes of irritable bowel syndrome are the following:

  1. Stress

    The first caus on our list is the one that you may find unbelievable but is actually of huge importance.

    You need to take care of a dog’s mental and emotional state, as it can have a great impact on his bowel movement.

    In these stressful situations, dogs are very similar to humans, and under stress or anxiety, they will also have diarrhea, causing large amounts of mucus and some blood.

    Some additional symptoms of stress include having the urge to go frequently or straining when defecating, so if nothing comes out, the reason for this state may simply be stress.

    It is important not to confuse it with constipation, as the straining will happen after your dog has already defecated several times.

    If it is a case of something more serious, then diarrhea will not resolve itself within 24 to 48 hours.

  2. Dietary Indiscretion

    Dietary Indiscretion happens if a dog eats something bad that caused an upset stomach.

    This problem can be easily solved with a bland diet or slippery elm bark.

  3. Food Intolerances

    Many breeds are prone to allergies or intolerances to food.

    This can also cause an upset stomach and the symptoms that can be noticed would be vomiting, flatulence, or diarrhea.

    Pay attention when giving dairy, undercooked eggs, raw meat or bones, or fried or greasy foods to your dog as these items can cause issues.

    If your dog has chronic diarrhea, it can be a result of eating foods that are toxic to dogs.

  4. Intoxication

    The worst possible scenario when food is in question is that your dog has ingested poison or toxic foods.

    The problematic food can be chocolate, gum, or grapes/raisins, and you can notice symptoms of vomiting and chronic diarrhea followed by more serious ones, such as wobbly gait, fatigue, fainting, and seizures.

  5. Recent Diet Changes

    For many reasons, dog owners tend to change brands of dog food.

    In the majority of cases, this should not be a problem, but sometimes mucus or liquid feces is a sign that your dog’s digestive system is trying to adjust to a new kind of food.

    Our suggestion is to introduce the new food slowly, and the best way is to mix it in increasing amounts with old food.

    Then you should notice the changes.

    If there is no severe diarrhea or constipation, as well as no sign of blood, you can continue feeding the new food, but in case your dog has not adjusted to his new food within a week’s time, and his stool did not return to normal, then you need to speak with your veterinarian.

  6. Inflammatory Bowel Disease (IBD)

    If you have not heard about inflammatory bowel disease, we would like to mention that this is a condition in which the intestine is chronically attacked by inflammatory cells.

    Infiltration of lymphocytes and plasmacytes cells is quite common in German Shepherd and Shar-Pei dogs, and this is the most common kind.

    The second most common form is the eosinophils cell.

  7. Crohn’s Disease

    Crohn’s Disease is known as granulomatous colitis or regional enteritis.

    This is a chronic form of IBD, and the first thing you can notice is a loose stool and a frequent urge to defecate.

    Furthermore, your dog’s stool may also contain bloody mucus, and if it starts losing appetite, and losing weight, you need to see the vet as the disease progresses.

  8. Colitis

    Large bowel diarrhea is often associated with colitis, and the symptoms you may notice are amounts of blood and excessive amounts of mucus.

    The first cause of colitis is stress, but there were situations when it was caused by an infection or parasites.

    Histiocytic ulcerative colitis is a rare disease and if you have a dog that has it, you will see a lot of blood in its stool.

  9. Presence of Parasites/Protozoans

    The most pathogenic worms that can be indigested through food, soil, or water are whipworms or tapeworms.

    These parasites live in the intestine and colon, can cause severe irritation and you may find whipworm eggs in the dog’s stool.

    Giardiasis is an intestinal infection caused by the protozoan parasite, giardia, and these are typically ingested from another animal’s feces as well as human feces.

    Symptoms that can be noticed in dogs with giardiasis are foul-smelling diarrhea that is watery, frothy, and contains a lot of mucus.

  10. Fungal Infection

    Histoplasmosis is a fungal infection, usually contracted by eating or inhaling contaminated soil or bird droppings.

    If your dog has it, loss of appetite and diarrhea with straining will be noticed.

  11. Small Intestinal Bacterial Overgrowth (SIBO)

    Small Intestinal Bacterial Overgrowth (SIBO) causes your dog to be unable to absorb raw food.

    What happens in its body is that the bacteria which is already present in the dog’s intestine eat the undigested food, so as to grow and overpopulate, thus causing an imbalance of good colon bacteria.

    SIBO is commonly seen in German Shepherds and some of the symptoms include yellow mucus, loose/soft stool, mucus coating on the stool, flatulence, chronic diarrhea, crankiness, and lethargy.

    In case of an imbalance of bacteria, Fortiflora probiotics can help restore that balance.

  12. Clostridial Enterotoxicosis

    Clostridial Enterotoxicosis is also characterized by an overgrowth of bacteria indigested through raw meats and vegetables or decaying foods.

    Diarrhea with a shiny mucus coating, stomach discomfort, frequent and watery stools, and straining are the symptoms of Clostridial Enterotoxicosis.

  13. Parvovirus

    Parvovirus is a highly contagious viral disease and you may notice lethargy, severe vomiting, bloody diarrhea, loss of appetite, and life-threatening dehydration.

    Parvovirus is usually found in puppies, adolescent dogs, and unvaccinated dogs.

    When breeds are in question, Rottweilers, Dobermans, and German Shepherds are highly prone to it.

  14. Ingesting Foreign Objects

    Some dogs are known to have an appetite for non-food items.

    If this is the case with your dog, it is not unusual that it has digestive problems.

    This is a bad habit that must be rid of through training.

  15. Polyps and Tumors of the Intestinal Lining

Rectal bleeding can be a symptom of polyps or tumors that have grown inside your dog’s intestinal lining or digestive tract, so you must take it to your vet.

Treatment for Mucus in Dog Stool

Due to the fact that some causes of mucus in your dog’s stool can be caused by a serious disease, we always suggest that you see a vet.

This is especially needed in case your dog has some other symptoms such as diarrhea, vomiting, bloody stools, abdominal pain, fever, or lethargy.

Why You Should See a Vet

You should definitely see a vet in the case of parasites, being that he/she will give you the appropriate dewormer which should kill all parasites.

If your dog has an intestinal blockage or a polyp, surgery may be needed.

When It’s Okay to Wait

If mucus in stool lasts for a short period of time, and your dog’s stool returns to normal after a few days, there is no reason to take it to a vet, as it can be caused by a dietary indiscretion or a recent diet change.

You can help your dog by feeding a bland diet for a few days.

Also, you can give it some probiotics or yogurts which contains live culture.

Imodium is allowed to be used under the guidance of your vet.

If you have noticed certain accompanying symptoms, or have doubts that your dog has eaten something toxic, you must see your vet promptly.

Yearly Fecal Exams Are Recommended

In conclusion, we would like to recommend something to dog owners.

They should not rely on visual inspections alone, and looking at your dog’s stools every day may not be enough, due to the fact that healthy-looking stools may be misleading.

In the dog’s stool, there are parasites that cannot be seen, except when a vet uses a microscope.

So, yearly fecal exams are always recommended to make sure your dog is really healthy.

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