Why Is My Dog Bleeding From Its Anus? - Causes

By Ameera Mills. Updated: November 21, 2018
Why Is My Dog Bleeding From Its Anus? - Causes

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Rectal bleeding in dogs, wherever it occurs, is always cause for alarm for pet owners. Anal bleeding in dogs can occur due to many different reasons. The origin of the bleeding, however, can differ. Therefore, it is incredibly important that if your dog is bleeding from its rectum, that you go to a veterinarian as soon as possible. A veterinarian will be able to make a correct diagnosis and treat the symptoms accordingly.

However, for more information, we here at AnimalWised wanted to discuss with you reasons why your dog is bleeding from its anus. We will be covering common causes of rectal bleeding, differentiating where the blood is really coming from and what you can do about it.

You may also be interested in: Why is My Dog Bleeding From Her Vagina?

Dog rectal bleeding - The digestive system of a dog

The digestive system of a dog starts at its mouth, continues down the esophagus to the stomach, small intensive, large intestine and ends at its anus. If there is a hemorrhage or naval cavity present in this system, it will naturally be expelled through the dog’s anus.

As we can see, the cause of bleeding in a dog’srear end can originate from several different areas of the body. This is why a diagnosis is so incredibly important. In order to proceed with a diagnosis, it is important to check the texture and presentation of the stool itself. Blood in a dog’s stool is medically refereed to as two types: Hematochezia or melena.

  • Hematochezia causes the expulsion of fresh, red and bright blood that can appear in normal or diarrheic stools. This bleeding in the dog's stool usually comes from the: colon, rectum or anus.
  • Melena causes a dog’s feces to appear black or tarry. This color suggests that the blood is coming from the upper intestinal tract.

In order to diagnose dog rectal bleeding effectively, one also needs to notice whether the blood is mixed with the feces, if it’s on the outside of the feces and what color the blood is. These all function as signs which can aid you in working out the cause of your dog bleeding from it’s bottom.


Why Is My Dog Bleeding From Its Anus? - Causes - Dog rectal bleeding - The digestive system of a dog

Rectal bleeding in dogs - Constipation

Is your dog bleeding from it’s rear end? Constipation may be one of the main causes. You can tell whether your dog is constipated by noticing that your dog does not defecate at all or does so, in a small amount, with obvious difficulty. These efforts of a dog trying to poo can often cause bleeding to occur. Constipation in dogs can be caused my many different things, one being dehydration. Dehydration in dogs can can cause a dog’s stool to dry up, which will naturally make it difficult to expel. For more, take a look at our article on; Signs My Dog Is Dehydrated.

If a dog swallows bones, tissues and other substances which are difficult or impossible to digest, this can also cause bleeding in your dog’s anus. Some medications can also result in constipation as a side effect. There are also many diseases which can cause constipation. These diseases include diseases such as hypothyroidism and other specific digestive diseases.

If you observe rectal bleeding in dogs, pain when defecating and/or painful effort to defecate, we suggest visiting your veterinarian as soon as possible. If your dog is in fact suffering from constipation, a doctor will be able to treat this effectively. You can also prevent constipation in your dog by;

  • Providing correct feeding and hydration that facilitates the intestinal transit.
  • Avoid bones.
  • Appropriate veterinary reviews that can detect diseases in time.
  • Maintenance of a safe environment preventing the ingestion of foreign bodies.
  • Never medicate a dog without veterinary supervision.
  • Give your animal sufficient opportunity to defecate and exercise.
Why Is My Dog Bleeding From Its Anus? - Causes - Rectal bleeding in dogs - Constipation

Canine rectal bleeding- Anal glands

A dog has two glands or sacs located on both sides of the anus. When feces are expelled, it can exert pressure on these glands. These glands then empty a liquid to aid with lubrication. Sometimes, however, these glands can become infected, which may explain why a dog might start bleeding from the anus. In these cases, a dog will feel pain and a yellow or bloody discharge will be released. A dog suffering from this problem will most likely rub its bum on the ground or lick this infected area. A veterinarian will be able to empty these glands and administer appropriate antibiotics to cure this infection[1].

Often, if the inflammation targets only one gland, it could mean that the dog is suffering from an abscess. This abscess can break the skin therefore producing a perianal fistula from which a bad-odored liquid will emerge. If this is the case, it is very important to go to the veterinarian as soon as possible, since these cases sometimes require surgery. Disinfection and the administration of antibiotics is necessary to treat abscesse[2].

Why Is My Dog Bleeding From Its Anus? - Causes - Canine rectal bleeding- Anal glands

My dog is bleeding from anus and throwing up

If you notice a dog bleeding from its rectum and vomiting, then it is incredibly essential to go to your veterinarian as soon as possible. This rectal bleeding in dogs partnered with vomiting can be a sign of various conditions or diseases, such as:

  • Ulcers in dogs: lesions in the mucosa of the digestive system, often caused by the use of medications such as corticosteroids, but also by diseases such as kidney or liver failure. They can cause vomiting, anemia, thinning. For more, take a look at; My Dog Has Kidney Failure.
  • Canine parvovirus: this condition mainly affects puppies and is characterized by the presence of vomiting and blood in diarrhea. It is a very serious and contagious, vaccination is essential for its prevention.
  • Dog poisoning: the ingestion of some toxins can cause symptoms such as rectal bleeding in dogs and/or vomiting blood. Immediate veterinary assistance is required as dog poisoning can result in fatality.
  • Heat stroke in dogs: an excessive increase in body temperature of a dog produces, among other symptoms, vomiting and diarrhea with blood. This can happen when, for example, a dog is left inside the closed car during the hottest hours of the day. Heat stroke if not treated immediately can result in death.
  • Renal insufficiency in dogs: Kidney failure in dogs can also cause vomiting and the presence of blood in feces, due to causes such as: gastrointestinal hemorrhages. The hemorrhages need to be stabilized by appropriate veterinarian treatment.

This article is purely informative. AnimalWised does not have the authority to prescribe any veterinary treatment or create a diagnosis. We invite you to take your pet to the veterinarian if they are suffering from any condition or pain.

If you want to read similar articles to Why Is My Dog Bleeding From Its Anus? - Causes, we recommend you visit our Other health problems category.


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Rebecca Hauck
My older puppy has bled from his anus when he has worms. I know he's had roundworms and a tapeworm but I suspect the bleeding came from hookworms. After treatment for all types of worms, his bleeding stops. Then months down the road when he has more worms, his behind bleeds again until treatment.
Administrador AnimalWised
Hi Rebecca,

Is your puppy being dewormed properly or is it exposed to other dogs or places which have worm infestations?
Catherine Tucker
My dog was bleeding from his nose and butt. I am devastated due to the fact I had to put him down. I am still confused over the fact this happened in less than 24 hours. I have no idea what he was dying from. Can you give me some illnesses that would have resulted in this fast lose of life.
I have an Aussie Shepard she is over 14 years old and is sick don't know what's wrong with her she is bleeding from her bottom don't have any money to take her to the Vet to see if she has to be put down I don't want her to suffer anymore want do I do about help with her don't even have money to put her to sleep and have her cremated.
Administrador AnimalWised
Hi Terry,

If you don't have the money to take your dog to the vet and you think they are in pain or near the end of their life, you should get in ouch with your local shelter. Even if they cannot do it themselves, they should be able to provide more information about what services are available in your local area. We are sorry to hear about your friend. Even though this is an incredibly sad situation, it sounds like she has had a long life with a caring person and that is a lot. Good luck!
We recently got a new 13 week old puppy. Two days after we got him our seven-year-old Yorky did not want to eat and he started bleeding from his rectum. Other than that he is not acting abnormal in anyway except the bleeding
Tonya Akins
Babygirl my 11 year old lab has had blood in her stools for the past two days.. She is also very swollen down from the anus ..she's not in heat ..and she's in pain .. She healthy otherwise and is drinking and eating .. What could this be .. Plz let me no
Administrador AnimalWised
Hi Tonya,

Our article suggests the possible reasons why there may be blood in your dog's school, but it is only informative and cannot replace a medical diagnosis. This will take a physical examination along with other tests. Please take them to the vet if you see such symptoms as they will be best able to provide diagnosis and treatment options.
geraldine a johnson
is there anything over the counter we can give our dog for this anal bleeding!
Administrador AnimalWised
Hi Geraldine,

If your dog has anal bleeding, it could be the symptom of many different potential causes. Only a vet will be able to diagnose the problem. There could be something over the counter which will help, but you could also be avoiding proper treatment which can seriously threaten the health of the animal.

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