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Blood and Mucus in a Dog's Stool: How to Treat Stress-Induced Diarrhea

Adrienne is a certified dog trainer and former veterinarian assistant who partners with some of the best veterinarians worldwide.

Stressed dog? Keep an eye on your dog's stools for blood.

Stressed dog? Keep an eye on your dog's stools for blood.

Blood and Mucus in Dog Poop: Causes

Just as you may get a bout of diarrhea the day prior to an interview or an important exam, your dog may get diarrhea with bloody stools when stressed. Typically, the course of events is quite obvious.

Your dog may get diarrhea when boarding, when he moves to a different place, or just moments before entering the show ring. In many cases, the cause of the diarrhea is quite obvious, it's episodic and clearly linked to the unusual event. The proving factor is that bloody diarrhea happens exclusively during the stressful event and not typically in the absence of it.

What is colitis?

In most cases, the colon is to blame. The colon is the large, lower section of the intestine. When a dog is stressed, the colon gets inflamed, causing rapid transit times and the release of mucus. This condition is known as colitis.

The dog typically has a soft stool that progresses into a gelatinous mass which often contains mucus, a slimy substance normally produced by the intestines to keep the colon's lining well lubricated. However, when the mucous increases, it's a sign of inflammation.

Also, at times, small erosions may form as well, causing bleeding. It is still not well understood why dogs are more predisposed to develop bloody stools compared to humans.

Other symptoms

  • Other accompanying symptoms include frequent bowel movements with a sense of urgency.
  • Your dog may whine, pant, shiver, and let you know he needs to be taken outside.
  • After several bowel movements, some dogs may position themselves and strain with nothing coming out. This is called "tenesmus" and it's often confused for constipation. In reality, it's just a clinical sign caused by the sensation of feeling the need to pass stools, despite an empty colon.

Fortunately, the bloody stool episode is often short-lived and resolves within 24 to 48 hours, explains veterinarian Dr. Marie. However, if it lasts longer than that and the dog starts acting lethargic and refuses to eat, a vet should be seen.

Other causes of colitis

Keep in mind that even though you may assume it's just stress, the colitis may be caused by another health problem that needs to be addressed. In some cases, an underlying health condition may flare up when the dog is stressed causing bloody stools in dogs. For instance, when a dog is stressed conditions such as coccidiosis, pancreatitis, and inflammatory bowel disease may raise their ugly heads.

How to Care for a Dog's Stress-Induced Diarrhea

  1. First and foremost, try to resolve the source of stress! This should help go to the source of the problem.
  2. If this is not possible, consider that there are many calming aids for dogs such as DAP diffusers, calming CDs, and tablets such as Composure by Vetriscience.
  3. Then, if there is diarrhea but your dog is lively, has a great appetite, and is his usual, happy self, you can try a 24-hour fast. This fast is helpful as it gives the colon a chance to rest. Feeding an irritated colon, only makes it more irritated!
  4. However, it's not a bad idea to give some plain, canned pumpkin (not the pie type with spices added!) during this fast. Give 2 tablespoons per 10 pounds of body weight twice daily, recommends veterinarian Dr. Fiona. During this time, clear fluids given a little bit at a time will help keep the dog well hydrated. Besides water, you can give unflavored Pedialyte, rice water (the water leftover from boiling rice) or onion-free, garlic/free chicken or beef broth diluted 50:50 with water.
  5. Afterward, a bland diet for dogs can be started for a few days until better stools are formed. Afterward, the dog can be weaned off it by adding gradual amounts of his regular food.
  6. It's important to note that sometimes the stress-induced colitis may be severe requiring a vet's intervention, In such a case, the vet may prescribe Flagyl (metronidazole) which helps reduce inflammation.

Warning: always keep an eye on your dog's stool! Also, consult with your vet if the blood in your dog's stool doesn't resolve or if the amount is increasing as your dog may develop anemia! Signs of anemia are weakness, pale gums and lethargy (learn to recognize the normal color of your dog's gums so you know when there is trouble!).

Can you give Pepto Bismol to a dog?

You may feel compelled to try using Pepto Bismol to help solve diarrhea, but don't! Pepto Bismol contains aspirin which is a blood thinner, and therefore, it's known to increase bleeding, and you definitely don't want that!

This article is accurate and true to the best of the author’s knowledge. It is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from a veterinary medical professional. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

Questions & Answers

Question: What causes stress in dogs?

Answer: Many things can causes stress in dogs. To just name a few, the addition of another dog, guests, the arrival of a new baby, noises, aversive training methods, other animals, being in a household with children, furniture moved around, walks in trafficked areas, being left alone too long, being boarded, hospitalized, going to the vet, car rides if the dog is not used to them, and so much more.

© 2013 Adrienne Farricelli


Adrienne Farricelli (author) on September 16, 2013:

Thanks Mathira!

mathira from chennai on September 16, 2013:

alexadry, excellent tips for dog lovers. I am one of them and I found your hub very useful.

Adrienne Farricelli (author) on September 16, 2013:

Yes, I remember we sold lots of these bags at the vet's office.

Adrienne Farricelli (author) on September 16, 2013:

Yes midget, many dogs indeed get this when they are boarded in kennels, kind regards!

Elizabeth Parker from Las Vegas, NV on September 16, 2013:

Our one dog has colitis and we've been feeding her DCO, which has worked great. Another great hub!!

Michelle Liew from Singapore on September 15, 2013:

I have had this problem with some of my dogs before and I agree completely, stress is a culprit, Alexandry. Thanks for sharing, and I share this with pet lovers too.