Dog Blood in Urine (Hematuria) - Causes, Diagnosis & When to See a Vet

> Disclaimer: This article is for informational purposes only and does not replace professional veterinary advice. If your dog has blood in their urine, please consult your veterinarian for an accurate diagnosis and treatment plan.

Quick Summary

Blood in a dog's urine (hematuria) means red blood cells are leaking into the urinary tract. It often signals an infection, bladder stones, inflammation, or sometimes serious conditions like cancer. While mild cases may resolve with treatment, blood in urine always warrants a veterinary visit to identify the cause and prevent complications.

What Does Blood in Urine (Hematuria) Look Like in Dogs?

Hematuria presents in several ways depending on how much blood is present and where it originates:

• Gross hematuria: Urine appears pink, red, or brown. Color may be streaky, uniformly tinted, or have visible clots.
• Microscopic hematuria: Blood is present but invisible to the naked eye; detected only on urinalysis.
• Initial hematuria: Blood appears at the start of urination (often lower urinary tract).
• Terminal hematuria: Blood appears at the end of urination (often bladder).
• Total hematuria: Blood throughout the entire stream (bladder or kidneys).

Common Causes of Blood in Urine (Hematuria) in Dogs

1. Urinary Tract Infection (UTI)

• What it is: Bacterial infection of the bladder or urethra.
• Other symptoms: Frequent urination, straining, accidents, licking genitals, odor.
• Breeds: Any; females more susceptible due to shorter urethra.

2. Bladder Stones (Urolithiasis)

• What it is: Mineral crystals that form stones in the bladder, irritating or injuring the lining.
• Other symptoms: Straining to urinate, frequent small urinations, crying out when urinating.
• Breeds: Dalmatians, Miniature Schnauzers, Shih Tzus, Bulldogs, Cocker Spaniels.

3. Cystitis (Bladder Inflammation)

• What it is: Inflammation of the bladder lining from infection, stones, or idiopathic causes.
• Other symptoms: Urgency, straining, pain, increased frequency.
• Breeds: Any.

4. Prostate Disease (Males)

• What it is: Enlargement, infection, or cancer of the prostate causing blood in urine.
• Other symptoms: Straining, difficulty defecating, lethargy.
• Breeds: Intact males; older dogs.

5. Bladder Tumors

• What it is: Cancerous growths in the bladder (e.g., transitional cell carcinoma) that bleed.
• Other symptoms: Straining, frequent urination, weight loss.
• Breeds: Scottish Terriers, Shetland Sheepdogs, West Highland White Terriers, Beagles.

6. Kidney Disease or Infection

• What it is: Pyelonephritis or kidney damage leading to bleeding into urine.
• Other symptoms: Increased thirst, vomiting, lethargy, decreased appetite.
• Breeds: Any; more common in older dogs.

7. Trauma

• What it is: Blunt force or penetrating injury to the abdomen or urinary tract.
• Other symptoms: Pain, bruising, lethargy, possible shock.
• Breeds: Any.

8. Blood Clotting Disorders

• What it is: Inherited or acquired conditions (e.g., rodenticide poisoning) that impair clotting.
• Other symptoms: Bleeding from other sites, bruising, pale gums.
• Breeds: Any; certain breeds predisposed to clotting disorders.

9. Urolith Obstruction

• What it is: Stone blocking the urethra, causing severe irritation and bleeding.
• Other symptoms: Inability to urinate, straining with little/nothing produced, distress.
• Breeds: Male dogs more at risk due to narrower urethra.

When Is Blood in Urine an Emergency?

Seek emergency care if your dog:

• Cannot urinate or produces only drops despite straining.
• Shows signs of severe pain (vocalizing, rigid abdomen, reluctance to move).
• Collapses or becomes weak with pale gums.
• Vomits repeatedly alongside bloody urine.
• Has bloody urine after known trauma (hit by car, fall, fight).
• Shows signs of poisoning (e.g., rodenticide exposure).

How Veterinarians Diagnose the Cause

Typical diagnostic steps:

1. Physical examination: Palpation of abdomen and bladder, rectal exam (especially in males).
2. Urinalysis: Checks for blood, bacteria, crystals, pH, protein, and concentration.
3. Urine culture: Identifies bacteria and antibiotic sensitivity if infection suspected.
4. Blood work: CBC and chemistry to assess overall health and organ function.
5. Abdominal ultrasound: Visualizes bladder, kidneys, stones, masses.
6. X-rays: Can detect certain bladder stones and prostate size.
7. Cystoscopy or biopsy: For persistent or suspicious cases, to evaluate bladder lining and obtain tissue samples.

Treatment Options

Treatment depends on the cause:

• UTIs: Antibiotics (typically 7–14 days); follow-up culture to confirm cure.
• Bladder stones: Dietary dissolution for some stone types; surgical removal often needed.
• Cystitis: Address underlying cause; pain relief; sometimes anti-inflammatories.
• Prostate disease: Antibiotics for infection; neutering; management of enlargement or cancer.
• Bladder tumors: Surgery, chemotherapy, or palliative care depending on stage.
• Kidney disease: Antibiotics for infection; supportive care for chronic kidney disease.

Prevention Tips

• Provide fresh water and frequent bathroom breaks.
• Keep genital area clean to reduce UTI risk.
• Spay/neuter to reduce prostate and some reproductive-related risks.
• Feed a balanced diet appropriate for breed and life stage.
• Avoid rodenticide exposure; use pet-safe pest control.
• Routine wellness exams and urinalysis for at-risk breeds or senior dogs.

Frequently Asked Questions