What Causes Blood in Dog’s Urine?

Blood in urine can have many possible causes

The presenting symptom of a pet urinating blood can have many potential causes. The most important question I ask pet owners with a dog having blood in its urine is to find out whether it is associated with urgency, straining, increased frequency, or difficulty urinating. In those cases, one of the more common causes is overgrowth of various bacteria in the urinary tract, which is usually best treated by a veterinary exam, urine analysis and possibly prescription antibiotics by your vet for pet medicines like Amoxicillin, Clavamox, Cephalexin or Baytril.

Most of the first time simple urinary tract infections usually respond within several days; however, if the symptoms are relapsing or don’t resolve, then a sterile urine culture is performed to look for resistant bacteria, thus allowing a better antibiotic selection, and/or x-rays performed to look for other abnormalities (like urinary tract calculi or stones).

If no known causes are apparent then a more complete workup including CBC/chemistry blood work, as well as ultrasound of the abdomen can be done to look for other abnormalities such as hormonal disorders like Cushing’s disease, diabetes, as well as urinary tract anatomic abnormalities, in addition to even polyps or tumors, particularly in older pets.

Many overweight dogs can sometimes have recurrent urinary tract infections because of anatomic problems associated with a deep seated or sunken vulva, as well as extra skin folds in the vaginal area, which may need surgical correction to prevent urinary tract infection relapse. Even after a thorough diagnostic workup, there are cases in which veterinarians are unable to figure out why a pet has recurrent urinary tract infections. In those cases, some vets will prescribe pulse antibiotic therapy the first several days of each month, or low dose PM continuous chronic antibiotic therapy given at bedtime.

There are also holistic options that can be explored like homeopathy or traditional Chinese medicine or acupuncture. For pets with simple signs of acute urinary tract infections or inflammations, I will advise pet owners to use immune boosting supplements like Cranberry Relief, which can boost the immune system of the urinary tract, along with vitamin C at various dosages.

In cases in which there is chronic bloody urine or bloody discharge from the urethra without signs of urinary tract straining, urgency or frequency, then those pets should have a complete evaluation. This should include not only urine analysis/culture, but also full blood panels to screen for diseases that could be involved with bleeding or clotting disorders such as autoimmune diseases of the platelets, genetic clotting abnormalities, tick borne diseases, etc.

With a systematic approach to dogs with bloody urine, most cases can be adequately diagnosed and controlled with time and patience.

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  1. Best to take him to vet ASAP, as could have bladder stones and/or blockage developing. Hopefully just a urinary tract infection which will respond to prescription antibiotic. Until you can have vet exam, you can try cranberry products from 1800petmeds, as well as products like D mannose from health food store

  2. My boxer is peeing clotting blood,she is drinking and eating. what is wrong??

  3. Hi Michelle. Many possibilities from infection of bladder/urinary tract to bladder stones, polyps/growths, bleeding disorders, etc. Best to see vet for complete workup

  4. Our dog was straining to urinate, when I watched her finally go it was bloody. Today there’s no urgency and she’s urinating without any problem and a normal amount with no blood.

  5. hi Kelly. Still best to go to vet for exam and urine analysis to check for crystals and infection, as well as x rays to look for bladder stones.

  6. MY DOG is a 4 year old Doberman , symptoms are weight loss, appetite is low, bleeds in urine , vet has done x rays , complete blood count, and others and my pet is same no improvement treated him for UTI did no difference . What else do I do?? I feel they’re not giving me answers I need and my pets health keeps deteriorating

  7. My dog pee blood this morning! I’m worried about my dog! Do u know why he is peeing blood?

  8. Hi Liz. We recommend you consult your vet to determine the cause and the best treatment. I hope he’s better soon.
    ~ Abby, PetMeds Pro

  9. Hi my little 7yr old Shihtzu was passing a lot of blood in her urine, prior to that i noticed she was refusing food and water, she very quickly went down hill by becoming extremely weak she went from unable to stand to lying down and unable to lift her head in the same day and i had to carry her out and hold her up to pee, i got straight on the phone to pdsa and explained only to be told I’ll get someone to call you, over an hour later i called back as I’d not had a call and again told I’ll get someone to call, another 30 mins later i finally got a call so i explained again that my dog is passing blood and by this time her gums were white, there was no urgency and the vet asked me if i wanted to go to pdsa for antibiotics or bring her for a check up. Why was I given a choice, this was late afternoon of 22nd August she was worst on the evening and i made a decision I’d call pdsa as soon as they opened the following morning, i finally fell asleep holding little maisey and woke up at 3.20am 23rd August 2021 and she had died now I’m thinking it’s my fault for choosing antibiotics.

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