Narrowing of the Anal or Rectal Opening in Dogs

Rectal Stricture in Dogs

Rectal stricture is a condition where the rectal or anal opening is constricted due to the presence of scar tissue from inflammation, a previous injury, or an aggressive cancer growth. This narrow opening(s) obstructs the passage of stools, thereby resulting in issues with the cat’s digestive system. Rectal stricture is not hereditary.

Dogs and cats of both genders, and most breeds and ages may be affected by strictures. If you would like to learn more about how this condition affects cats, please visit this page in the PetMD health library.

Symptoms and Types

Symptoms will vary depending on the severity of the condition. Some symptoms include constipation, diarrhea, and difficulties while defecating. The feces is often covered in mucus and blood-stained. There also may be a compensatory increase in the size of the dog’s large intestine as a result of the stricture.


Both male and female dogs suffer from strictures, as do most breeds and age groups. Although, dogs that have had rectal or anal abscesses, inflammation, fistulas, a foreign body in the anal passage, or fungal infection are at a higher risk of sustaining the condition. Cuts or wounds in the area, cancerous growths, and some surgeries (e.g., removal of part of the rectum for biopsy) can also put animals at higher risk for developing strictures.


Your veterinarian will perform a thorough physical exam on your dog, taking into account the history of its symptoms and possible incidents that might have precipitated the stricture. Some common tests include a complete blood count and a urinalysis, which will usually return as normal. If your dog has an existing infection or inflammation, the white blood count may be high.

A manual examination of the rectum might be required to determine the extent and location of the stricture. Ultrasonography of the abdominal area may also be performed; this might show thickening of the stomach walls and a change in the structure of the internal tissues, especially if cancer is present.

X-rays of the abdominal area and injection of contrast dyes (barium, air, or double-contrast enema) may show narrowing of the rectal and intestinal canal. These tests will be completed as a multi-step process: first, a warm water enema will be administered, followed by the dye injection six hours later. A combination of air and barium media is most effective for testing.

A colonoscopy, using a tubular, flexible camera inserted through the anal opening, will help your veterinarian to visualize the stricture internally and determine the extent of the stricture. This is also a convenient method for obtaining a tissue sample for further evaluation, which is helpful for determining if you dog has cancer, or a fungal or parasitic infection.


The very end of the large intestine


A device that can be implanted into a blood vessel to keep it from collapsing


An in-depth examination of the properties of urine; used to determine the presence or absence of illness


The prediction of a disease’s outcome in advance


A band of tissue that makes a passage narrower


A medical condition in which the body has lost fluid or water in excessive amounts


The widening of something


Introducing fluid into the rectum of a living thing


The process of removing tissue to examine it, usually for medical reasons.


A type of slime that is made up of certain salts, cells, or leukocytes

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