Why Is My Dog Peeing Blood?

In this guide

Blood in a dog's urine, known as haematuria, always warrants a vet visit, even if your dog otherwise seems completely fine. The urine can look pink, red, or brownish, or the blood may only be detectable under a microscope during testing.

Common Causes

• Urinary tract infections, the most frequent cause overall
• Bladder or kidney stones and crystals, which irritate the bladder lining as they move
• Bladder tumours, including transitional cell carcinoma, more of a concern in older dogs
• Trauma, such as being hit by a vehicle or a hard fall
• Toxin exposure, including rodenticide poisoning, which affects blood clotting
• Prostate disease in intact male dogs, including infection or enlargement
• Clotting disorders, whether inherited or acquired

An Important Exception

In an unspayed female dog, blood seen around the vulva may actually be coming from her heat cycle rather than the urinary tract. Heat cycles typically last two to three weeks, and this bleeding has a different source and pattern than true haematuria. If you are unsure which is happening, a vet visit will confirm it either way.

How Urgent Is It

If your dog is eating, drinking, and behaving normally aside from the blood, it can generally be seen by your regular vet within 24 hours rather than treated as a middle of the night emergency. However, straining to urinate, complete inability to urinate, lethargy, vomiting, or known or suspected toxin exposure means immediate emergency care is needed.

What to Expect at the Vet

Diagnosis usually starts with a urinalysis and often a urine culture to check for infection, followed by imaging such as an X-ray or ultrasound to look for stones or masses. Treatment depends entirely on the cause: antibiotics for infection, a prescription diet or surgery for certain stones, or more involved treatment for tumours or prostate disease.

Collecting a Sample

If you can, collect a fresh urine sample in a clean container before your vet visit, ideally the first urination of the day, since this gives the most useful information and can speed up diagnosis.

Diet's Role in Prevention

For dogs prone to certain types of bladder stones, your vet may recommend a specific prescription diet formulated to manage urine pH and mineral concentration, alongside encouraging regular, generous water intake. Sticking closely to a vet recommended diet, rather than switching foods based on general advice, matters here since different stone types actually need different, sometimes opposite, dietary approaches.

Encouraging more frequent urination through regular bathroom breaks also supports bladder health generally, since urine that sits in the bladder for long stretches gives minerals more time to form crystals. Dogs left alone for long working hours may benefit from a midday walk arranged through a trusted neighbour or dog walker for this reason.

Common Questions

Are certain breeds more prone to bladder stones?

Yes, breeds such as Dalmatians, Miniature Schnauzers, and Bichon Frises have a known predisposition to certain types of bladder stones, though any breed can develop them. Diet and hydration both play a role in prevention.

Could a urinary tract infection alone explain blood without other symptoms?

Yes, a straightforward UTI can sometimes cause visible blood while a dog otherwise feels and acts completely normal. This does not make it less important to treat, since untreated infections can spread to the kidneys.

This article is for general awareness and does not replace veterinary advice. If your dog is unwell, consult a veterinarian promptly.

Article content © Ravi Teja. All rights reserved.