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Red or brown urine (hemoglobinuria) in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Urgent see a veterinarian within 24 hours

RED if there is pallor, rapid deterioration, collapse, shortness of breath, jaundice, Fever, dark brown "cola" urine, tachycardia, or suspected hemolytic crisis/shock.

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Definition

Hemoglobinuria is the excretion of hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. in a dog’s urine, which causes the urine to take on a reddish or brownish color. This change can indicate a range of health problems, from harmless to severe.

Can Occur with the Following Diseases:

Basics and possible causes

Hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. is a proteinProteins are large molecules made up of amino acids and play an essential role in almost all biological processes. They are necessary for building body tissue, the function of the immune system, and as enzymes for metabolic reactions. in red blood cells responsible for oxygen transport in the blood. When red blood cells are destroyed or damaged, hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. is released and can enter the urine, leading to the characteristic discoloration.

One of the main causes of hemoglobinuria is hemolysishemolysis is the process of red blood cell breakdown, releasing hemoglobin. It can be triggered by various factors, including certain diseases, toxins, or incompatible transfusions., the process of red blood cell breakdown. This can be caused by immune-mediated diseases, infections, toxins, or mechanical damage. A common cause of hemolysishemolysis is the process of red blood cell breakdown, releasing hemoglobin. It can be triggered by various factors, including certain diseases, toxins, or incompatible transfusions. in dogs is immune-mediated hemolytic anemia (IMHA), where the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. mistakenly attacks its own red blood cells.

Other causes can include infectiousInfectious describes the ability of a pathogen to be transmitted from one individual to another and trigger an infection. It also refers to diseases caused by such pathogens. diseases like leptospirosis or babesiosis, which are transmitted by parasites. Certain poisons, such as onions or garlic, can also cause damage to red blood cells. Mechanical causes could arise from heart or vascular diseases, where blood cells are destroyed in turbulent blood flows.

Even massive physical exertion, especially in untrained dogs, can lead to temporary hemoglobinuria. However, this is rather rare and should subside after a rest period.

Typical accompanying symptoms

Lethargy and weakness: Dogs with hemoglobinuria often show signs of lethargy and weakness, as oxygen transport in the body is impaired.
Pale mucous membranes: Due to the loss of red blood cells, the dog’s mucous membranes may appear pale.
Jaundice: A yellowish discoloration of the skin and mucous membranes can occur if liver problems or elevated bilirubinBilirubin is a yellow pigment that is produced when hemoglobin from red blood cells is broken down. It is further processed in the liver and then excreted via the bile. Elevated bilirubin levels may indicate liver dysfunction or impaired bile excretion. concentration are present.
Dark, concentrated urine: In addition to the reddish or brownish color, the urine may also appear darker and more concentrated.
Fever: Infections or inflammatory processes can cause Fever.
Loss of appetite: Some dogs lose their appetite and show disinterest in food.
Rapid breathing or heart rate: The body tries to compensate for the lack of oxygen, which can lead to accelerated breathing or heartbeat.

When to see a vet?

A veterinarian should be consulted immediately if the dog’s urine shows a reddish or brownish discoloration, especially if additional symptoms such as lethargy, loss of appetite, or jaundice occur. These symptoms can indicate serious health problems that require urgent medical intervention.

Even if the dog shows Pain during urination or if the problem persists for more than a day, it is absolutely necessary to seek veterinary advice. A delay in treatment can lead to a worsening of the condition and make treatment more complicated.

Symptom recognition for the pet owner and veterinary diagnostic procedure

For pet owners, it is important to regularly observe the dog’s urine, especially if the dog already suffers from a disease that could affect red blood cells. A reddish or brownish discoloration of the urine should be taken seriously.

The veterinarian will first take a thorough medical historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. and physically examine the dog. A urinalysis is often the first diagnostic step to confirm the presence of hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. in the urine. Blood tests can help identify the cause of hemolysishemolysis is the process of red blood cell breakdown, releasing hemoglobin. It can be triggered by various factors, including certain diseases, toxins, or incompatible transfusions. and assess the dog’s general health.

In some cases, additional diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. tests such as ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. or X-rays may be necessary to rule out structural problems or internal injuries. If infections are suspected, specific tests can be performed to identify pathogens.

What the pet owner can do and professional therapy options

While waiting for the veterinarian or until diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., the pet owner can take some measures to support the dog’s well-being. The dog should have access to plenty of clean water to support kidney function and prevent dehydrationDehydration occurs when the body loses more fluid than it takes in. This can lead to a number of problems, including headaches, Dizziness, and in extreme cases, renal failure or Cardiovascular collapse..

It is advisable to keep the dog in a calm and stress-free environment to avoid unnecessary stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being.. Physical exertion should be avoided so as not to worsen the condition.

A balanced and nutritious diet can help support the dog’s health while the underlying cause of hemoglobinuria is being treated. It is important to follow the veterinarian’s advice and administer prescribed medications exactly as directed.

Outlook on current research

Current studies focus on identifying the molecular mechanisms that lead to hemoglobinuria in dogs. Research specifically investigates the role of oxidative stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and genetic factors that can impair the stability of red blood cells. Advances in genome research and molecular diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. enable scientists to identify more precise biomarkers that indicate hemoglobinuria early.

Another area of research deals with the development of new therapeutic approaches for treating the underlying causes of hemoglobinuria. Innovative medications and gene therapies play a role here, specifically targeting the genetic mutations that can occur in certain breeds or individual dogs. The application of CRISPR technology for correcting genetic defects is also being investigated.

Environmental factors that can increase the risk of hemoglobinuria are also a focus of research. Studies investigate how diet, lifestyle, and exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to certain toxins can influence the presence of hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. in the urine. This research helps to develop preventive measures that can reduce the risk for dogs.

Another significant advance is the development of non-invasive diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. methods. Researchers are working on refining urine tests and imaging techniques that allow veterinarians to diagnose hemoglobinuria quickly and accurately without invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. procedures. These methods facilitate disease monitoring and assessment of treatment response.

The role of the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. in the development of hemoglobinuria is also being intensively researched. Scientists are investigating how autoimmune processes and inflammatory reactions can contribute to red blood cell damage and hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. release. These findings could lead to new immunomodulatoryImmunomodulatory describes the ability of a substance to modify the reaction of the immune system. Immunomodulatory drugs can either stimulate the immune system to fight infections more effectively or suppress it to prevent overreactions. therapies that could slow or stop the progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the disease.

Another focus is on researching breed predispositions for hemoglobinuria. Genetic studies aim to identify specific breeds that are more susceptible to this disease due to genetic factors. This information is crucial for breeding programs and educating dog owners about potential risks.

Additionally, the role of infectiousInfectious describes the ability of a pathogen to be transmitted from one individual to another and trigger an infection. It also refers to diseases caused by such pathogens. diseases that can cause hemolysishemolysis is the process of red blood cell breakdown, releasing hemoglobin. It can be triggered by various factors, including certain diseases, toxins, or incompatible transfusions. and subsequent hemoglobinuria is being investigated. Researchers analyze how bacterial and viralViral refers to viruses and their effects on the organism. Viral infections in dogs and cats can range from harmless colds to severe, life-threatening diseases. pathogens affect the integrity of red blood cells and lead to hemoglobinhemoglobin is an iron-containing protein in red blood cells responsible for transporting oxygen from the lungs to the body tissues and carbon dioxide back to the lungs. release. These studies are important for the development of vaccines and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies.

Finally, researchers are working on developing personalized treatment approaches tailored to a dog’s individual genetic and environmental factors. These personalized approaches promise to increase the effectiveness and safety of therapies and improve the quality of life for affected dogs. The integration of Big Data and artificial intelligence into research will further advance the development of such customized treatments.

Frequently asked questions

1. What does it mean if my dog's urine is reddish or brownish?

Red or brownish urine in dogs can indicate the presence of hemoglobin released from red blood cells. This is often a sign of hemolysis, where red blood cells are destroyed.

2. Is reddish or brownish urine in dogs always an emergency?

Not necessarily, but it should not be ignored. It is important to have the dog examined by a veterinarian as soon as possible to determine the cause and rule out serious diseases.

3. Can certain foods color my dog's urine?

Some foods, especially those with artificial colorings or certain pigments, can temporarily discolor the urine. However, this discoloration is usually harmless and disappears when the food is discontinued.

4. What tests are performed to determine the cause of reddish or brownish urine?

The veterinarian can perform a urinalysis, blood tests, and imaging procedures such as ultrasound or X-rays to determine the cause of the discoloration.

5. Can stress cause reddish or brownish urine in my dog?

Stress alone does not usually cause hemoglobinuria, but it can worsen existing health problems. A veterinarian should be consulted to rule out underlying causes.

6. How is hemoglobinuria treated in dogs?

The treatment depends on the underlying cause. Possible treatments include medications to control infections or autoimmune reactions, dietary changes, or, in severe cases, blood transfusions.

7. Can medications be the reason for reddish or brownish urine?

Some medications can cause hemolysis as a side effect, which can lead to reddish or brownish urine. The veterinarian should be informed about all medications the dog is taking.

8. Can dehydration discolor my dog's urine?

Dehydration can make urine appear more concentrated and darker, but it does not usually cause reddish or brownish discoloration due to hemoglobin.

9. Are certain dog breeds more susceptible to hemoglobinuria?

Yes, certain breeds have a higher risk due to genetic predispositions. A responsible breeder can provide information about known health problems in a breed.

10. How can I avoid my dog developing reddish or brownish urine?

Regular veterinary check-ups, a balanced diet, adequate hydration, and avoiding toxins can help minimize the risk. In cases of known genetic predispositions, early monitoring is crucial.