Blood in your dog’s urine usually signals a problem somewhere in the urinary or reproductive tract. The most common causes are urinary tract infections, bladder stones, and inflammation, though the list ranges from easily treatable conditions to more serious ones like poisoning or cancer. The color can vary from light pink to dark red, and sometimes you’ll only notice it on light-colored surfaces or in snow.
Urinary Tract Infections
A bacterial urinary tract infection is one of the most frequent reasons dogs pee blood. Bacteria irritate and inflame the bladder lining, causing tiny blood vessels to leak red blood cells into the urine. You’ll often notice your dog straining to urinate, squatting more frequently than normal, or having accidents indoors. The urine may look cloudy or have a strong odor.
Uncomplicated UTIs in dogs are typically treated with a course of antibiotics lasting about seven days. Before 2011, the standard was 10 to 14 days, but shorter courses have proven equally effective for straightforward infections. Complicated or recurring UTIs may require up to four weeks of treatment. Your vet will ideally run a urine culture to identify the specific bacteria involved so the right antibiotic is chosen rather than guessing.
Bladder and Kidney Stones
Mineral stones that form in the bladder or kidneys scratch and irritate the urinary tract lining as they shift around, causing bleeding. The two most common types in dogs are struvite stones (made of magnesium ammonium phosphate) and calcium oxalate stones. Urate stones are the third most common type. These stones can range from sand-like grains to large, jagged formations.
Certain breeds carry a higher genetic risk. Shih Tzus, Lhasa Apsos, Pomeranians, Miniature and Toy Poodles, Dachshunds, and several terrier breeds (Yorkshire, Cairn, Jack Russell) are commonly affected by calcium oxalate stones. English Bulldogs, Boston Terriers, American Staffordshire Terriers, and Rottweilers can carry an inherited genetic mutation that significantly increases their calcium oxalate risk. Dalmatians are well known for forming urate stones due to their unique metabolism.
Struvite stones can sometimes be dissolved with a prescription diet that adjusts urine pH and mineral content. Calcium oxalate stones, however, cannot be dissolved and need to be physically removed. Dogs with a history of recurring stones should be monitored with imaging every three to six months to catch new stones while they’re still small enough to remove without surgery.
In male dogs, stones can lodge in the urethra and cause a complete blockage. A dog that is straining to urinate but producing little or no urine needs immediate veterinary attention, as a full obstruction is life-threatening.
Prostate Problems in Male Dogs
Intact (unneutered) male dogs are prone to benign prostatic hyperplasia, an enlargement of the prostate gland that commonly causes intermittent blood in the urine. You might also notice bloody discharge from the penis unrelated to urination. The condition is hormone-driven, and neutering often resolves it. Left untreated, an enlarged prostate can become more susceptible to bacterial infection (prostatitis), which brings additional pain, fever, and difficulty urinating or defecating.
Bladder Cancer
Bladder cancer accounts for roughly 2% of all cancers in dogs, so it’s uncommon but worth knowing about, especially in predisposed breeds. The most typical form is invasive transitional cell carcinoma. The symptoms look nearly identical to a UTI: blood in the urine, straining, frequent attempts to urinate, and indoor accidents. That overlap is why vets take persistent or recurring bloody urine seriously, particularly in older dogs.
Scottish Terriers face an 18 to 20 times higher risk of bladder cancer compared to other breeds. Shetland Sheepdogs, Beagles, West Highland White Terriers, and Wire Hair Fox Terriers have three to five times the average risk. About 20% of dogs with this cancer already have detectable spread at the time of diagnosis, which is why early investigation matters.
Rat Poison and Other Toxins
If your dog has access to garages, sheds, or areas where rodent bait might be present, anticoagulant rat poison is a serious possibility. These poisons work by blocking vitamin K recycling in the liver, which shuts down the body’s ability to form blood clots. Without functional clotting, bleeding can occur anywhere in the body, including into the urinary tract. Bloody urine from poisoning is often accompanied by lethargy, pale gums, bleeding from the nose or gums, bruising under the skin, or bloody stool. Symptoms can take two to five days to appear after ingestion, so by the time you notice them, the poisoning may already be advanced.
Trauma and Less Common Causes
A blow to the abdomen, a fall, or being hit by a car can damage the kidneys, bladder, or urethra and cause bloody urine. Clotting disorders unrelated to poisoning, such as inherited bleeding conditions or immune-mediated diseases that destroy platelets, can also allow blood to leak into urine. In female dogs, uterine infections or vaginal conditions can sometimes be mistaken for bloody urine when blood drips during or after urination.
What Your Vet Will Do
The first step is almost always a urinalysis. A normal urine sample collected during urination may contain up to 8 red blood cells per high-powered microscope field, so your vet needs to see numbers above that threshold to confirm true hematuria. The analysis also checks for bacteria, crystals, protein, and abnormal cells. A urine culture identifies the specific bacteria if infection is suspected.
Imaging typically follows. Abdominal X-rays can reveal most types of bladder and kidney stones, since the majority are dense enough to show up clearly. Ultrasound provides a more detailed look at soft tissue, allowing the vet to spot masses, thickened bladder walls, prostate enlargement, or stones that don’t appear on X-rays. If a mass is found, a needle biopsy guided by ultrasound can help determine whether it’s cancerous.
For suspected poisoning, blood clotting tests are the priority. For recurring or unexplained hematuria, additional contrast studies of the urethra or advanced imaging may be needed.
Signs That Need Emergency Care
Some situations can’t wait for a regular appointment. Get your dog to an emergency vet if you notice any of the following alongside bloody urine:
- Inability to urinate: repeated straining with little or no urine coming out, especially in male dogs, suggests a blockage.
- Pale gums: lift your dog’s lip and check the color. Pale, white, or gray gums indicate significant blood loss or anemia.
- Collapse or extreme weakness: inability to stand or walk, or a sudden change in alertness.
- Known or suspected toxin exposure: if rat poison, antifreeze, or another toxic substance is missing or chewed open.
- Heavy, continuous bleeding: large amounts of blood rather than a pink tinge.
- Severe pain: vocalizing, guarding the abdomen, or refusing to move.
A single episode of mildly pink urine in an otherwise normal, energetic dog is less alarming, but it still warrants a vet visit within a day or two. Repeated episodes, worsening color, or any combination with the symptoms above moves the timeline up significantly.