Blood in Dog Urine: Causes and When It Is Urgent

By Tailwisp Editorial TeamUpdated October 17, 20263 min read

Seeing red in the toilet or on the grass can be alarming. It is a symptom worth acting on promptly.

Is it really blood?

Red or pink urine can come from blood, but myoglobin, certain foods, medications and dyes can change urine color too. Blood in urine is usually pink, red or brown, and may include clots. Take a clear photo and collect a sample if you can, since your vet can confirm it.

Common causes

• Urinary tract infection. See urinary tract infections in dogs
• Bladder or kidney stones. See bladder stones in dogs
• Trauma, such as from being hit by a car. See dog hit by car
• Prostate disease in intact males
• Heat cycle in females, where blood can come from the vagina rather than the urinary tract. See dog heat cycle
• Tumors of the bladder, kidney or prostate
• Clotting disorders, including rat poison ingestion and inherited conditions. See dog poisoning: what to do and von Willebrand's disease in dogs
• Kidney disease or infection. See kidney disease in dogs
• Medications, such as some chemotherapy drugs

When it is an emergency

Go straight to a vet if:

• Your male dog is straining and passing little or no urine
• Your dog is weak, pale or vomiting
• There was trauma
• Your dog may have eaten rat poison
• Your dog seems in severe pain
• There is blood from other places, such as gums or stool

What your vet may do

Your vet will examine your dog, perhaps feel the bladder and prostate, and recommend urinalysis, a culture, bloodwork, clotting tests and imaging such as X-rays or ultrasound. A free-catch or sterile sample may be collected.

Treatment depends on cause

• Infections: antibiotics based on culture
• Stones: diet, medication or surgery
• Toxin exposure: vitamin K and supportive care for rodenticides
• Tumors: staging and treatment options
• Hormonal or prostate disease: neutering or medication as advised

Collecting information

Note when you first saw blood, whether it appears at the start, middle or end of urination, how often your dog goes, appetite, water intake and any recent injuries or medications. Bring a photo. See how to prepare for a vet visit.

At-home care while waiting

1. Offer water, but do not force it.
2. Allow frequent toilet breaks.
3. Keep your dog calm and quiet.
4. Do not give human medication.
5. Contact your vet or emergency clinic.

Preventing recurrences

• Provide water and frequent toilet breaks
• Treat infections promptly and complete antibiotics
• Follow diets prescribed for stones
• Keep rodent bait out of reach
• Schedule regular checkups

Common mistakes

• Assuming it will clear on its own
• Giving antibiotics from an earlier illness
• Missing a blockage in a male dog
• Not mentioning heat cycles or medications

Troubleshooting

• Blood appears only once: still book an exam.
• Urine looks red after treats: check for dye, but confirm with a test.
• My female is in heat: ask whether the blood is vaginal or urinary.

A simple plan

1. Photograph the urine.
2. Check for emergency signs.
3. Contact your vet.
4. Follow testing and treatment.

Real-life examples

A spaniel with blood and frequent urination has a UTI that clears on antibiotics. A schnauzer has stones removed surgically. A terrier that got into rat bait needs vitamin K therapy. Causes and urgency vary.

Prompt action matters

Early evaluation widens treatment options and often shortens recovery.

The takeaway

Blood in urine always needs a vet visit. Treat inability to urinate as an emergency.

This article is general educational information, not veterinary advice. Every dog is different. If your dog is unwell, or you are unsure about a symptom, diet change or medication, contact your veterinarian.