Blood in Dog Urine: What Should You Do?

Published by Dr. Patty Khuly
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Find Food that fits your pet's needs

Find Food that fits your pet's needs

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If you're a dog parent, you might find your dog peeing blood at some point. But, while blood in dog urine is a scary sight, it's often treatable. A simple urinary tract infection or a benign prostate problem can be the cause.

Hematuria is a term used to describe when blood appears in a dog's urine. This is often due to inflammation or infection in the urinary system which could include the upper or lower urinary tract. The presence of blood in the urine or hematuria should be evaluated by your veterinarian to identify the cause and provide recommendations to help your dog.

Here are common causes of blood in dog urine, what you should do if it affects your dog and the treatments your veterinarian may recommend.

Upper Urinary Tract Causes

As in humans, a dog's upper urinary tract contains two kidneys. Blood in urine originating in this part of the urinary tract tends to affect the kidneys. Some causes for bleeding in the upper urinary tract include:

  • Idiopathic renal hematuria: This is blood in the urine that results from the kidney for an unknown reason. It could be due to medicine, an infection or an issue with the immune system. This is generally considered a benign condition with a hereditary element.

  • Kidney infection: If your dog is peeing blood, one or both of your dog's kidneys could possibly be infected.

  • Kidney stones: While uncommon, kidney stones can affect one or both kidneys resulting in the presence of blood in the urine.
  • Kidney cancer: While uncommon, kidney cancer can affect dogs and cause blood in dog urine. The cancer can remain in the kidney or spread to other parts of the body.
  • Renal telangiectasia: Some dogs, including Welsh corgis, have a genetic predisposition to this spontaneous widening of blood vessels in the kidney, which can lead to blood in their urine.

Smiling Welsh corgi pembroke dog lying down in the green grass

Lower Urinary Tract Causes

The lower urinary tract includes the bladder and the urethra, the tube that connects the bladder to the outside world and allows urine to exit the body. Causes for bleeding here include the following:

  • Bladder infection: A lower urinary tract infection (UTI) is by far the most common cause for a dog peeing blood. It can be caused by skin allergies; the anatomy of the urethra, vulva or prepuce; and hormone-related incontinence in spayed females.
  • Bladder stones: These can form for a variety of reasons, including genetics, nutrition and chronic infection.
  • Bladder cancer: Bladder cancer in dogs often looks similar to a UTI; it can cause accidents in the house, difficulty urinating and blood in the urine.
  • Prostate problems: Benign prostate enlargement and prostate infection are the most common prostate problems in male dogs who haven't been neutered.

Causes for blood in dog urine that can affect both the upper and lower urinary tracts include a ruptured bladder, which can happen if they're hit by a car or attacked by another dog; coagulopathy (a scientific word that essentially means clotting problems); and vasculitis, or inflammation of the blood vessels.

Diagnosis and Treatment

If you see your dog peeing blood, contact your vet to make an appointment as soon as possible. As a general rule, any dog peeing blood for the first time should be seen by a vet within 24 hours.

At the visit, the vet will try to diagnose the underlying cause of the blood by analyzing your dog's urine. A urine culture may be recommended to see if bacteria might be causing the issue. They may also conduct a blood test or take an X-ray or an ultrasound.

Treatment depends on the specific cause of the blood. The vet may prescribe antibiotics if the issue is related to bacteria. In cases of benign prostate enlargement and prostate neoplasia, they are likely to recommend neutering. They are also likely to suggest surgery if they find the blood is caused by bladder stones or a variety of other issues.. Vets commonly prescribed anti-inflammatory or pain medicine to ease dogs' discomfort.

Your vet may also recommend a change in food. Nutrition is an important component in managing urinary tract problems in dogs. Wet foods can help achieve more dilute urine, and certain foods can reduce stone formation and optimize urine pH.


Preventing Future Urinary Problems

Taking your dog for regular veterinary checkups is the best way to prevent blood in their urine and other urinary problems. Your vet can tell you if your dog is predisposed to urinary issues. If they are, the vet can routinely test your dog's urine to make sure they're in tip-top health.

Also, while it may be easy to just let your dog in the backyard to do their business alone, monitoring your dog's urinary habits occasionally is a necessary part of being a dog parent. Letting an issue like blood in the urine persist can lead to more serious consequences. You are your dog's first line of defense to their health, so careful monitoring and discussions with your vet are pertinent. With love and attention, you can help keep your dog happy and healthy.

Contributor Bio

Dr. Patty Khuly

Dr. Patty Khuly is an honors graduate of both Wellesley College and the University of Pennsylvania School of Veterinary Medicine. She received her MBA at The Wharton School of Business as part of the prestigious VMD/MBA dual-degree program. She's now the proud owner of Sunset Animal Clinic in Miami, Florida. But that's not all. Dr. K is a nerdy reader, avid knitter, hot yoga fanatic, music geek, struggling runner, and indefatigable foodie. She lives in South Miami with three dogs, countless cats, two rescued goats and a hilarious flock of hens.

You can follow her writing at and at

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