Seeing blood in your dog’s urine can be alarming, especially when your dog is also showing signs of a urinary tract infection (UTI).
The urine may look pink, red, orange, or brown, or you may notice small amounts of blood toward the beginning or end of urination.
Some dogs may also urinate frequently, strain to pee, have accidents indoors, or lick their genital area more than usual.
The meaning of blood in the urine depends on your dog’s other symptoms, age, medical history, how much blood is present, and whether the problem appeared suddenly or has been developing over time.
While blood can occur with a straightforward UTI, it should not automatically be assumed that a UTI is the only explanation.
Understanding the possible reasons for bloody urine can help you recognize when your dog needs veterinary attention.
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Dog UTI and Blood in Urine: Why It Happens
A dog may have a UTI and blood in the urine because inflammation and irritation of the bladder or urinary tract can cause small blood vessels in the urinary lining to bleed.
This can make urine appear pink, red, or contain visible streaks of blood. Dogs with a UTI may also urinate frequently, strain while urinating, pass only small amounts of urine, or seem uncomfortable when peeing.
However, blood in the urine can also occur with conditions other than a simple bladder infection.
Urinary stones, kidney disease, trauma, prostate problems, clotting disorders, and other urinary tract conditions can produce similar signs, which is why testing is important when a dog has hematuria (blood in the urine).
Dog UTI and Blood in Urine: Common Causes
Bacterial urinary tract infection
A bacterial UTI is one of the more common reasons a dog may have blood in the urine. Bacteria can irritate the bladder lining, causing inflammation and bleeding.
A dog with a UTI may also:
Urinate more often than normal
Strain or take longer to urinate
Pass only small amounts of urine
Have urinary accidents
Lick around the genital area
Seem uncomfortable when urinating
Have urine with an unusual odor
Blood may be visible throughout the urine or may only appear occasionally.
Bladder inflammation
Bladder inflammation, sometimes called cystitis, can cause blood in the urine even when a bacterial infection is not the underlying problem.
Inflammation may occur for several reasons, including irritation from urinary stones or other urinary tract problems. A urinalysis and additional testing can help determine whether bacteria are actually present.
Urinary stones
Bladder or urinary stones can irritate the lining of the bladder and cause bleeding.
They may also cause frequent urination, straining, discomfort, or repeated attempts to urinate.
Some stones can become lodged in the urinary tract. If a dog is repeatedly trying to urinate but little or no urine is coming out, this can indicate a potentially life-threatening urinary obstruction.
Related: Dog UTI and not eating (Why it happens)
Kidney infection
A urinary infection can sometimes involve the kidneys rather than remaining limited to the bladder.
A dog with a more significant urinary infection may develop additional signs such as lethargy, reduced appetite, vomiting, fever, or abdominal or back discomfort.
Kidney involvement is more concerning than an uncomplicated lower urinary tract infection and requires prompt veterinary assessment.
Kidney or urinary tract disease
Blood in the urine can sometimes originate higher in the urinary system. Kidney disease, inflammation, structural abnormalities, or other urinary tract disorders can produce hematuria.
These conditions may not always cause obvious urinary symptoms at first. Changes in thirst, urination volume, appetite, weight, or energy can provide additional clues.
Trauma
An injury to the abdomen, back, pelvis, or urinary tract can cause blood to appear in a dog’s urine. This may happen after a significant impact, fall, accident, or other trauma.
Blood following an injury should not automatically be attributed to a UTI, particularly if the dog is painful, weak, unusually quiet, or having difficulty urinating.
Prostate problems in male dogs
In male dogs, prostate disease can sometimes cause blood in the urine.
This becomes particularly relevant when bloody urine occurs alongside difficulty urinating, straining to defecate, recurrent urinary problems, or other changes associated with the reproductive or urinary tract.
A veterinarian may examine the prostate as part of the investigation when appropriate.
Bleeding or clotting disorders
Less commonly, blood in the urine may occur because of a problem affecting the body’s ability to control bleeding.
Certain diseases, toxins, medications, or other systemic conditions can interfere with normal clotting.
When bleeding occurs in other places as well, such as the nose, gums, skin, or digestive tract, veterinary assessment becomes especially important.
Urinary tract growths or masses
Growths involving the bladder or other parts of the urinary tract are less common but can cause blood in the urine, particularly when the problem is persistent or recurrent.
A mass cannot be diagnosed from the appearance of the urine alone. Imaging and other diagnostic tests may be needed if the cause remains unclear.
Related: Dog not responding to antibiotics for UTI (Here’s Why)
Dog UTI and Blood in Urine but Acting Normal
A dog can have a UTI and blood in the urine while still acting relatively normal, particularly when the problem is mild or has only recently started.
Dogs may continue eating, playing, and behaving normally despite having urinary discomfort.
However, acting normal does not establish that the condition is harmless. Persistent blood in the urine should still be investigated, particularly if it continues, returns after treatment, or is accompanied by frequent urination or straining.
Dog UTI and Blood in Urine With Frequent Urination
Blood in the urine together with frequent urination is a pattern commonly seen with irritation or inflammation of the lower urinary tract.
Affected dogs may repeatedly ask to go outside, squat more often than usual, or produce only small amounts of urine.
A UTI is one possible explanation, but bladder stones and other urinary conditions can produce a similar combination of symptoms. Urine testing helps distinguish among these possibilities.
Dog UTI and Blood in Urine With Straining
Straining to urinate deserves particular attention. A dog with bladder inflammation may strain because urination is uncomfortable, but repeated straining with very little or no urine can indicate that urine flow is being obstructed.
A urinary blockage is an emergency because the bladder may become dangerously distended and the kidneys can be affected.
A dog that repeatedly attempts to urinate without producing a normal stream should be evaluated promptly.
Dog UTI and Blood in Urine After Antibiotics
If your dog has already been treated for a UTI but blood remains in the urine, the infection may not have completely resolved, the bacteria may not be susceptible to the medication used, or the original problem may not have been a simple bacterial UTI.
Another condition, such as urinary stones or another source of bladder irritation, may also be responsible.
Recurrent or persistent symptoms usually warrant follow-up testing rather than simply repeating treatment without determining the cause.
When to Call or Visit the Vet
Contact your veterinarian if your dog has blood in the urine, particularly when the bleeding is persistent, recurrent, or accompanied by other urinary changes.
Seek immediate veterinary care if your dog:
Repeatedly strains to urinate but produces little or no urine
Cannot urinate normally
Has a large amount of blood or urine that is distinctly red
Has blood clots in the urine
Seems painful when urinating
Is vomiting or refusing food
Becomes very tired, weak, or collapses
Has fever or significant abdominal or back pain
Develops marked changes in thirst or urine production
Has blood in the urine after significant trauma
Has other unexplained bleeding
Has urinary symptoms that are worsening or returning after treatment
Dog UTI and Blood in Urine: Treatment
Treatment for a dog UTI and blood in the urine depends on whether a bacterial infection is actually present and what is causing the bleeding.
A veterinarian will typically perform a physical examination and urinalysis, and may recommend a urine culture to identify bacteria and determine which antibiotics are appropriate.
Depending on the dog’s age, symptoms, and medical history, blood tests, X-rays, ultrasound, or other testing may be used to look for stones, kidney problems, obstruction, prostate disease, or another underlying condition.
Treatment may include diagnosis-directed medication, management of urinary stones or obstruction, or other supportive or procedural care as needed.
Key Takeaway
Dog UTI and blood in the urine can occur together because infection and inflammation may irritate the urinary tract and cause bleeding.
Frequent urination, straining, accidents, and discomfort while peeing can support the possibility of a urinary problem.
However, blood in the urine is not specific to a UTI. Urinary stones, kidney disease, trauma, prostate problems, bleeding disorders, and other urinary tract conditions can cause similar signs.
Testing is therefore important, especially when the blood persists or returns.
If your dog is unable to urinate, repeatedly strains without producing urine, becomes weak or very ill, or develops significant pain or vomiting, seek veterinary care immediately.
Even when your dog seems otherwise normal, unexplained blood in the urine deserves veterinary evaluation so the underlying cause can be identified and treated appropriately.