Why Does My Dog Pee Blood? Common Causes and Warning Signs
Seeing blood in your dog’s urine can be alarming. The urine may look pink, red, orange-red, or appear normal except for small traces of blood.
Blood in the urine is called hematuria. It is a symptom rather than a diagnosis, and it can occur for several reasons involving the bladder, urinary tract, kidneys, or other parts of the body.
Some dogs with bloody urine may otherwise seem completely normal, while others may urinate frequently, strain to pee, have accidents indoors, show discomfort, lose their appetite, or become less active.
Because the possible causes range from urinary tract irritation to conditions that require prompt veterinary treatment, blood in a dog’s urine should not simply be ignored.
If your dog has other symptoms and you are not sure what they might mean, you can also use our Pet Symptom Checker to learn about common symptoms and warning signs.
What Does Blood in a Dog’s Urine Look Like?
Blood in urine does not always look the same.
Sometimes the urine is clearly pink or red. In other cases, you may notice only a reddish tint, small spots of blood after your dog urinates, or discoloration that appears intermittently.
The medical term for blood in the urine is hematuria. Red blood cells may enter the urine because of bleeding or inflammation somewhere within the urinary or reproductive system.
However, urine color alone cannot tell you exactly what is causing the problem. Other pigments can also change urine color, which is one reason veterinary testing may be necessary.
Why Does My Dog Pee Blood?
There are several possible reasons a dog may have blood in the urine.
Common possibilities include urinary tract infections, bladder inflammation, urinary stones, irritation or injury within the urinary tract, kidney problems, prostate disease in male dogs, and some less common medical conditions.
The symptoms occurring alongside the blood often provide important clues.
For example, frequent attempts to urinate, passing only small amounts of urine, or straining may point toward a urinary tract problem that needs veterinary investigation.
1. Urinary Tract Infection
A urinary tract infection (UTI) is one possible cause of blood in a dog’s urine.
UTIs usually occur when bacteria enter the urinary tract and multiply. The bladder is a common location for these infections.
According to Cornell University College of Veterinary Medicine, common signs of a UTI in dogs include straining to urinate, frequent urination in small amounts, accidents in the house, foul-smelling urine, excessive licking of the genital area, and blood in the urine. (Veterinária Cornell)
Some dogs show several of these signs, while others may have only one or two.
Because these symptoms can also occur with bladder stones and other urinary problems, symptoms alone cannot confirm a UTI.
2. Bladder Stones
Bladder stones are another possible cause of bloody urine.
These stones are mineral formations that develop within the urinary system. As they move or come into contact with tissues in the bladder, they can contribute to irritation and bleeding.
- urinate more frequently
- strain while urinating
- pass only small amounts of urine
- have urinary accidents
- show signs of discomfort
Cornell notes that bloody urination, increased urinary frequency, and straining can occur with struvite bladder stones. Stones can sometimes obstruct urine flow, which is a medical emergency. (Veterinária Cornell)
3. Bladder Inflammation
Inflammation of the bladder, often called cystitis, can also cause blood to appear in the urine.
Inflamed bladder tissue may become irritated and bleed. A dog may repeatedly ask to go outside, squat or lift a leg several times, or produce only small amounts of urine.
Cystitis may have different underlying causes, so determining why the bladder is inflamed is important.
A veterinarian may use urine testing and other examinations to investigate the cause rather than assuming that every case of bladder inflammation is an infection.
4. Kidney or Upper Urinary Tract Problems
The kidneys and ureters are also part of the urinary system, so problems higher in the urinary tract can sometimes result in bloody urine.
One example is pyelonephritis, a bacterial infection involving the kidneys.
Dogs with a kidney infection may show additional symptoms such as decreased appetite, increased thirst or urination, vomiting, lethargy, abdominal discomfort, or straining to urinate. Blood may also be present in the urine. (Veterinária Cornell)
These symptoms warrant veterinary evaluation because kidney infections can become serious.
5. Urinary Crystals and Other Types of Stones
Dogs can develop several types of urinary crystals and stones.
Some are associated with infection, while others can develop because of genetic, metabolic, dietary, or other factors.
Stones can form in the kidneys or bladder and may irritate urinary tissues.
In certain cases, stones can move into the urethra and interfere with the dog’s ability to urinate.
This is particularly important because a urinary obstruction can become life-threatening.
6. Prostate Problems in Male Dogs
In male dogs, the prostate gland is located near the urinary tract.
Conditions affecting the prostate may sometimes cause blood to appear in urine or produce other urinary symptoms.
Possible signs may include difficulty urinating, straining, changes in urinary habits, or discomfort.
Because several different prostate conditions can cause similar symptoms, veterinary examination is needed to determine the underlying problem.
7. Injury or Trauma
An injury involving the urinary system can sometimes lead to blood in the urine.
The severity can vary considerably depending on what happened and which tissues were affected.
If bloody urine appears following a significant accident or injury, veterinary assessment is important even when the dog initially seems normal.
8. Bleeding Disorders
Less commonly, problems involving normal blood clotting can contribute to bleeding in different areas of the body, potentially including the urinary tract.
A dog with a bleeding disorder may have other signs of abnormal bleeding or bruising.
These conditions cannot be identified based on urine appearance alone and require veterinary testing.
9. Tumors of the Urinary Tract
Tumors affecting the urinary system are less common than several other causes of bloody urine, but they are another possibility veterinarians may consider.
The Merck Veterinary Manual notes that urinary-system tumors are uncommon in dogs, and possible signs can include hematuria, difficulty urinating, lethargy, and weight loss. (Merck Veterinary Manual)
The presence of blood does not mean that a dog has cancer. Many other conditions can produce the same symptom.
This is why diagnostic testing is important, particularly when bloody urine persists or repeatedly returns.
Why Is My Dog’s Urine Red?
Red urine and bloody urine are not always exactly the same thing.
Blood is one possible explanation for red or pink urine, but changes in urine color can sometimes result from other pigments.
A veterinarian can perform a urinalysis to determine whether red blood cells are actually present.
The Merck Veterinary Manual explains that increased red blood cells in urine indicate bleeding somewhere within the urogenital system, although the method used to collect a urine sample can sometimes introduce blood into the sample. (Merck Veterinary Manual)
Therefore, appearance alone should not be used to determine the cause.
Why Is My Dog Peeing Blood but Acting Normal?
A dog may have blood in the urine while continuing to eat, play, walk, and behave normally.
That does not necessarily mean the problem is harmless.
Some urinary conditions can begin with relatively subtle signs. A dog might initially show only discolored urine or slightly more frequent urination.
Watch for changes such as increased urinary frequency, straining, passing small amounts, licking around the genital area, accidents indoors, reduced appetite, increased thirst, or changes in energy.
Even when a dog seems comfortable, visible blood in the urine is a reason to contact a veterinarian for guidance.
Why Is My Dog Peeing Blood and Urinating Frequently?
Frequent urination together with blood can occur with several urinary conditions.
A dog may repeatedly ask to go outside but produce only a small amount each time.
This pattern can occur when the bladder or urinary tract is irritated. UTIs and bladder stones are among the conditions that can produce both frequent urination and blood. (Veterinária Cornell)
Pay attention to whether urine is actually coming out each time.
Frequent urination is very different from repeatedly trying to urinate without successfully passing urine.
Why Is My Dog Straining to Pee?
Straining means your dog repeatedly attempts to urinate or appears to have difficulty passing urine.
This may happen because the urinary tract is painful, inflamed, irritated, or partially obstructed.
A dog may squat or lift a leg repeatedly while producing only drops or very small amounts.
If your dog repeatedly attempts to urinate but little or no urine comes out, seek veterinary care promptly.
Why Is My Dog Peeing Blood and Not Eating?
Loss of appetite together with bloody urine deserves additional attention.
A dog that does not want to eat may be experiencing pain, nausea, infection, or another illness affecting overall health.
Kidney infections, for example, can cause decreased appetite along with urinary symptoms. (Veterinária Cornell)
Watch for vomiting, lethargy, abdominal discomfort, feverish behavior, increased thirst, weakness, or difficulty urinating.
The combination of symptoms is often more informative than bloody urine alone.
Why Is My Dog Peeing Blood and Vomiting?
Vomiting occurring together with urinary problems can be concerning.
It may indicate that the dog is becoming systemically unwell rather than experiencing only mild urinary irritation.
Vomiting can also occur in severe urinary obstruction. Cornell describes obstruction as a potentially life-threatening emergency. (Veterinária Cornell)
If your dog has bloody urine and repeated vomiting, especially with difficulty urinating, lethargy, or abdominal discomfort, seek veterinary attention promptly.
Is Blood in a Dog’s Urine an Emergency?
Blood in urine should be taken seriously, but the urgency depends partly on what other symptoms are present.
Bladder stones can irritate the urinary tract and may cause blood in the urine, frequent urination, straining, discomfort, or other urinary symptoms.
One of the most important things to observe is whether your dog can actually urinate.
A dog that is repeatedly attempting to pee but producing little or no urine may have a urinary obstruction.
Urinary obstruction is a medical emergency because urine cannot leave the bladder normally. Cornell notes that obstruction can become life-threatening. (Veterinária Cornell)
Prompt veterinary attention is also important when bloody urine occurs with repeated vomiting, marked lethargy or weakness, significant pain, collapse, inability to urinate, or rapidly worsening symptoms.
Can Blood in Dog Urine Go Away on Its Own?
The visible discoloration might disappear temporarily, but that does not necessarily mean the underlying cause has resolved.
Some urinary symptoms can come and go.
For example, you might notice blood during one bathroom trip and normal-looking urine later.
Because urinary infections, stones, inflammation, and other conditions can produce intermittent symptoms, disappearance of visible blood should not automatically be considered proof that the problem is gone.
Contacting your veterinarian is appropriate when you notice visible blood in your dog’s urine.
How Do Veterinarians Investigate Blood in a Dog’s Urine?
Veterinarians usually begin with your dog’s medical history and a physical examination.
They may ask when you first noticed the blood, how often your dog urinates, whether your dog strains, how much urine is produced, and whether other symptoms are present.
A urinalysis is one of the most useful tests for investigating urinary symptoms.
It can provide information about red and white blood cells, urine concentration, crystals, bacteria, and other characteristics.
When infection is suspected, a veterinarian may also recommend a urine culture to identify bacteria and help determine appropriate treatment. Depending on the findings, blood tests, X-rays, ultrasound, or other diagnostic procedures may also be recommended. (Veterinária Cornell)
Should I Take a Picture of My Dog’s Urine?
If you notice unusual urine color, a photograph may help you remember exactly what you observed and may be useful when discussing the symptom with your veterinarian.
Also note whether the urine looked pink, red, orange, or otherwise unusual.
Pay attention to:
- how often your dog urinates
- whether the amount is normal or very small
- whether your dog strains
- whether blood appears every time or only occasionally
- whether appetite or water intake has changed
- whether vomiting or lethargy is present
These observations cannot diagnose the cause, but they can provide useful context.
Should I Collect a Urine Sample?
Your veterinarian may ask for a urine sample, but the preferred collection method can depend on what needs to be tested.
For example, when investigating a possible bacterial UTI, veterinarians often prefer a sample collected in a way that minimizes contamination. Cornell explains that urine may be collected directly from the bladder for this purpose. (Veterinária Cornell)
Therefore, before trying to collect or store urine yourself, ask the veterinary clinic whether they want you to bring a sample and how they would like it collected.
Should I Give My Dog Human Medication?
Do not give your dog human pain relievers, leftover antibiotics, or other medications unless a veterinarian specifically instructs you to do so.
Bloody urine can have many different causes, and treatment depends on identifying the underlying problem.
For example, antibiotics may be appropriate for a confirmed bacterial infection but would not address every possible cause of bloody urine.
What Can I Do While Monitoring My Dog?
Keep fresh water available and observe your dog’s urinary habits closely while arranging veterinary guidance.
The most important observation is whether your dog is successfully passing urine.
Notice the color, frequency, approximate amount, and whether urination appears difficult or uncomfortable.
Also monitor appetite, drinking, energy level, vomiting, and other changes.
Do not delay veterinary care simply because your dog still seems playful or because the urine temporarily returns to a normal color.
Check for Other Symptoms
Bloody urine may occur alone or alongside other symptoms.
If your dog is drinking much more water than usual, read our guide Why Is My Dog Drinking So Much Water?
If your dog is urinating much more frequently, see Why Is My Dog Peeing So Much?
If appetite has decreased, see Why Is My Dog Not Eating?
If vomiting is also occurring, see Why Is My Dog Vomiting?
Looking at symptoms together can help you describe the situation more clearly to your veterinarian, although only a veterinary examination can determine the underlying cause.
Frequently Asked Questions
What is blood in a dog’s urine called?
The medical term is hematuria. It means red blood cells are present in the urine.
Can a UTI cause blood in a dog’s urine?
Yes. Blood in the urine is one possible sign of a urinary tract infection in dogs. Other signs may include frequent urination, straining, urinary accidents, or foul-smelling urine. (Veterinária Cornell)
Can bladder stones cause bloody urine?
Yes. Bladder stones can irritate urinary tissues and may cause bloody urine, frequent urination, or straining. Some stones can also cause urinary obstruction. (Veterinária Cornell)
Why is my dog peeing blood but acting normal?
Some dogs with urinary problems may initially behave normally. However, visible blood can still indicate an underlying urinary problem, so veterinary guidance is appropriate even if your dog seems comfortable.
Can dehydration cause bloody urine in dogs?
Dehydration can make urine more concentrated, but visible blood should not automatically be attributed to dehydration. A veterinarian can investigate whether blood is actually present and what may be causing it.
Is it dangerous if my dog cannot pee?
Yes. Repeated attempts to urinate with little or no urine coming out may indicate an obstruction. Urinary obstruction can be life-threatening and requires urgent veterinary care. (Veterinária Cornell)
How does a veterinarian check for blood in urine?
A urinalysis can detect and evaluate red blood cells and other components of urine. Additional testing may be needed depending on the findings. (Merck Veterinary Manual)
Bottom Line
If you are wondering, “Why does my dog pee blood?”, there are several possible explanations, including urinary tract infections, bladder inflammation, urinary stones, kidney problems, and other urinary or systemic conditions.
The color of the urine alone cannot determine the cause.
Pay attention to how often your dog urinates, whether urine is actually coming out, and whether other symptoms such as vomiting, loss of appetite, lethargy, pain, or increased thirst are present.
Visible blood in the urine deserves veterinary attention, and a dog that repeatedly attempts to urinate but produces little or no urine needs prompt veterinary care.
**Sidnir Vieira**
Founder of TechHavela
A passionate pet and tech content creator, helping dog owners across the U.S. make smarter decisions for their furry friends.
