Why Does My Dog Make Bloody Stools and Mucus?

Why is my dog ​​making bloody stools and mucus - causes

Have you seen blood in the dog’s stool? It is normal that if we observe this in our pet we worry and want to know what happens and what we should do. But when this happens to a dog, really, the reasons that may be causing it are diverse and not all are serious and, therefore, the possible solutions are also several.

Anyway, whenever something like this is observed in our furry it is vital that we go to the vet to detect the origin of the problem and solve it promptly before it worsens. Of course, from UNCOMO we want to help you be as informed as possible and, for this reason, in this article we tell you everything you need to know to clear up your questions about “Why does my dog ​​make bloody stools and mucus?“and other related ones, like” what happens if a dog defecates blood? “.

The color of blood in the stool

The first thing that we must take into account in order to know the causes of blood in the dog’s feces is that it can be mainly of two different types that we can differentiate according to the color tone it has. Knowing the color we can begin to distinguish the origin of the problem, discarding some possibilities and seeing that others, on the other hand, do fit. Thus, we can differentiate between these two types of blood in dog droppings: the mane and hematochezia.

What is the mane in dogs

Many people when they hear this word wonder:what is the mane in dogs?, but in reality it is a symptom that can occur in any animal and means the same in all. In this case, the blood has been digested and for this reason it has a dark, blackish-red color, it is thick and even its smell is strong and very unpleasant. That it has been digested indicates that its origin is in the upper or first part of the digestive system. As due to the dark color it is sometimes difficult to discern if there is blood or not, if we detect a very strong smell and we are suspicious, we can collect the excrement and take it to the vet or with a piece of absorbent paper pick it up and see if the paper is spot of a reddish color.

What is hematochezia in dogs

It is the presence of fresh blood in the stool so the color of this is a bright red tone. This tone is so because it has not gone through the long digestive process and this fact indicates that its origin is in the lower or final part of the dog’s digestive system. In these cases, the problem usually occurs in the colon or rectum of the animal and the blood can be seen as drops when the animal defecates or it can be mixed in the rest of the excrement. In severe cases or those that have worsened, you may see that your dog expels blood through the anus, that is, he may try to defecate, but not pass stools and only expel some fresh blood, with or without mucus.

Next, we explain what happens if a dog defecates blood depending on whether it is one type or the other. Pay attention and know the possible causes, but do not forget to take your furry to the vet to diagnose and treat the problem.

Why is my dog ​​making stools with blood and mucus - causes - The color of blood in the stool

Causes of mane in dog feces

If you have detected, or the veterinary specialist has diagnosed, that your faithful companion makes stools with dark blood, then now it is necessary to detect what is the possible origin of the problem to start a treatment promptly if necessary. As the melena can come from the nose, mouth, pharynx, esophagus, lungs, stomach or upper part of the small intestine, it can be caused by something mild or by a serious problem, for this it is vital that You go to your vet as soon as possible. Thus, among the main causes of mane in dog droppings we find the following:

Swallowed blood

One of the most common reasons is that the furry has ingested blood, for example by licking a wound or having bled from the nose or mouth, and this has been digested, producing the mane at the end. Thus, make sure that the muzzle and the rest of your partner’s body do not have recent injuries.

Blood clotting disorder

There are various disorders of the clotting factor of dogs, for example Von Willebrand’s disease or hemophilia. In this case, you can also see that if your furry suffers a wound, it takes time to stop bleeding and close. In addition, some poisonings or poisoning in dogs can also cause a clotting problem and consequent bloody stools. In both cases it is vital to go as soon as possible to the nearest center or hospital with your pet.

Complications after a surgical intervention

If your furry has undergone surgery in the last 72 hours and defecates dark blood, it may be due to a problem in postoperative recovery. In this case you should call the emergency vet.

Medication use

The use of NSAIDs (non-steroidal anti-inflammatory drugs) and the use of Pepto Bismol, an upset stomach product, can cause a dark color to your stools. In the case of NSAIDs, bleeding ulcers can occur that cause the appearance of dark bloody excrements, but in the case of Pepto Bismol it will not be blood but this product, while consumed, gives the excrement a blackish appearance.

Bleeding tumors and polyps

Tumor masses cause a multitude of problems and can give rise to various symptoms, always depending on their origin, state and situation in the body. A bleeding tumor can cause your furry dog ​​to have bloody stools. The same happens in the case of polyps that can occur in the digestive system.

In addition, there are more things that can cause problems with digested blood in the stools of dogs. For example, other possible causes may be some bacterial infections become serious, such as a Campylobacter infection, trauma that affects the digestive system, some fissure in this or a intestinal obstruction.

Why does my dog ​​make bloody stools and mucus - causes - Causes of mane in dog stools

Causes of hematochezia in dogs

In the case of detecting blood from a bright red color in their droppings, you should go to the vet as soon as possible since there are many possible reasons and some of them serious. Thus, between the main causes of hematochezia in dogs we find the following:

Parvovirus in dogs

Canine parvovirus is one of the most serious canine diseases that mainly affects puppies. If you observe blood in the stool of a puppy dog, go to the nearest hospital or center as soon as possible since, among other symptoms such as vomiting and lethargy, this blood in his stools is an indicator that he may suffer from parvovirus and he needs veterinary attention as soon as possible. , as this disease can be fatal.

Hemorrhagic gastroenteritis

It is a condition that produces a gastrointestinal picture with vomiting, diarrhea and blood in them. The cause of this gastroenteritis is very difficult to diagnose, but it is vital for the recovery of your faithful companion that a specialist reviews him, diagnoses the problem, even if it is difficult to find the cause, and that he is administered as soon as possible the most appropriate medication for his case and fluid therapy.


If your dog is stressed or has anxiety, either on a specific basis or for a longer period of time, this can cause bloody stools. From a new tenant at home, a move, leaving it for a few days with someone or in a kennel or suffering from separation anxiety will cause your dog to suffer stress and discomfort, affecting its digestive system. For this, you must find the source of their stress and modify it.

Wounds to the rectum

Rectal wounds can be caused by severe constipation or by ingesting a foreign object or body such as a stick or a piece of toy. This will cause irritation and damage the lining of the rectum causing bleeding.


The presence of internal parasites in dogs is one of the main reasons for hematochezia. So it is very important not to skip any deworming and take our pet for frequent check-ups, as well as take it to the specialist if parasites are detected in the droppings.


If we give him the wrong food, he has an intolerance or allergy to any food or we give too much food to a dog, we can cause irritation in the stomach, intestines or colon that gives rise to diarrhea, blood and mucus in the stools. A sudden change in the usual diet of your furry dog ​​can also cause this irritation, so you have to make changes in diet gradually.

Causes of mucus in dog feces

Mucus in dog feces can occur for various reasons. In fact, any of the causes mentioned above, both melena and hematochezia, can cause a dog defecates with blood and mucus.

Mucus in the stool is usually indicative of a irritation or injury to the mucous membranes or from some type of infection, usually caused by bacteria. Therefore, it is a symptom that is usually also present in the excrement along with the blood.

Why does my dog ​​make bloody stools and mucus - causes - Causes of mucus in dog stools

What to do if my dog ​​has bloody stools and mucus

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