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Discharge from the Vagina (Vaginal Discharge) Bloody in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

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Bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge in dogs refers to the presence of blood in the secretions that come from the animal’s vagina. This condition can occur in varying degrees of severity and is often an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient’s clinical condition. of underlying health problems, ranging from hormonal changes to serious illnesses.

Can Occur with the Following Diseases:

Basics and possible causes

Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge) in dogs is a symptom that can be triggered by a variety of causes. Bloody discharge can be normal in rare cases during estrusEstrus, also known as heat, is the phase in the reproductive cycle of female mammals when they are receptive to mating. In dogs and cats, this is the time when they are ready to mate., but it should generally not be ignored as it may indicate more serious health problems. The most common causes include hormonal fluctuations, injuries, infections, and Tumors.

A common cause of bloody discharge is pyometra, a bacterial infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. of the uterusThe uterus, also known as the womb, is a female reproductive organ in which the fetus grows and develops during pregnancy. It consists of muscle tissue and is lined with a mucous membrane. that particularly affects unspayed female dogs. This condition usually occurs a few weeks after estrusEstrus, also known as heat, is the phase in the reproductive cycle of female mammals when they are receptive to mating. In dogs and cats, this is the time when they are ready to mate. and can be life-threatening if left untreated. Another possible cause is vaginitis or Inflammatory conditions of the vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients., which can be caused by bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease., viruses, or fungi.

Bloody discharge can also indicate injuries or foreign objects in the vagina. Tumors, both benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. and malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats., can also cause bloody discharge. These can occur in the uterusThe uterus, also known as the womb, is a female reproductive organ in which the fetus grows and develops during pregnancy. It consists of muscle tissue and is lined with a mucous membrane., ovaries, or the vagina itself. Hormonal imbalances caused by irregular cycles or conditions such as Cushing’s syndromeA syndrome is a group of symptoms that occur together and indicate a specific disease or condition. A syndrome can be caused by various factors and is often complex in its diagnosis and treatment. can also lead to this symptom.

Typical accompanying symptoms

Increased Licking in the genital area: Dogs with Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge) tend to Lecken the affected area frequently to remove the secretion. This may be an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of irritation or discomfort.
Swelling or redness of the vulva: A visible Swelling or redness of the vulva may be an indicationIndication refers to a valid reason or rationale for using a specific treatment, medication, or medical procedure. It is based on the diagnosis and the patient's clinical condition. of an underlying Inflammatory conditions or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..
Fever: Fever can occur with bacterial infections such as pyometra as the body tries to fight the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..
Loss of appetite: Reduced food intake can be a non-specific sign of a variety of health problems, including those associated with bloody Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge).
Changes in drinking behavior: Increased thirst can occur with hormonal problems or infections.
Lethargy: A general lack of energy or Müdigkeit can indicate a systemic disease.
AbdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. pain: Dogs with uterine Inflammatory conditions or Tumors may show signs of Pain in the abdominalThe term "abdominal" refers to anything that concerns the belly or the abdomen. It is an adjectival expression used to describe the location, symptoms, or conditions that occur in the abdominal area. area, such as a hunched back or a sensitive abdomenThe abdomen, also known as the abdominal cavity, is the part of the body located between the rib cage and the pelvis. It houses several important organs, including the stomach, liver, kidneys, intestines, and spleen..

When to visit the vet?

A visit to the veterinarian should not be delayed if a dog shows bloody Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge), especially if it is accompanied by other symptoms such as Fever, Lethargy, or loss of appetite. These signs may indicate serious conditions such as pyometra, which requires rapid medical intervention.

Even if the bloody discharge is not accompanied by other worrying symptoms, it is important to clarify the cause. An early visit to the veterinarian can help to avoid serious complications and initiate the correct treatment.

Especially in older dogs or those that are not spayed, attention should be paid to signs of health problems, as they have a higher risk of certain diseases such as Tumors or hormonal disorders.

Symptom recognition for animal owners and veterinary diagnostic procedures

It is important for the pet owner to pay attention to changes in the dog’s behavior or appearance. Symptoms such as increased Lecken, Schwellungen, or changes in drinking and eating behavior should be taken seriously. Keeping a diary of the symptoms and their frequency can help the veterinarian with the 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 veterinarian will usually perform a thorough clinical examination to determine the cause of the bloody discharge. This may include blood tests to detect signs of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. or hormonal imbalances. An 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 are often necessary to examine the uterusThe uterus, also known as the womb, is a female reproductive organ in which the fetus grows and develops during pregnancy. It consists of muscle tissue and is lined with a mucous membrane., ovaries, and other internal structures. In some cases, a vaginoscopyVaginoscopy is a diagnostic examination that uses an endoscope to visualize and examine the inside of the vagina. It can be used to diagnose infections, Tumors, and other abnormalities. may also be performed to inspect the vagina directly.

The exact 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. depends on the individual symptoms and the dog’s 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 the veterinarian will use all available information to determine the best course of action for further treatment.

What can pet owners do and professional therapy options

As a first step, the pet owner should ensure that the dog does not experience any further 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 remains in a quiet environment. It is important to provide the dog with enough fresh water and encourage it to drink to avoid 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., especially if Fever or loss of appetite is present.

As long as the exact cause of the bloody discharge has not been diagnosed, the pet owner should not take any treatment measures of their own, such as administering medication, unless they have been recommended by the veterinarian. Lecken of the affected area can be prevented by attaching a protective collar to avoid further irritation or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..

It is advisable to regularly monitor the dog for changes and report any new or worsening symptoms to the veterinarian immediately. Close cooperation with the veterinarian is crucial to ensure the best possible care and treatment for the dog.

Outlook on current research

Current research is intensively investigating which molecular and genetic factors in dogs can contribute to the development of bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge. One study using genome sequencing aims to identify genetic predispositions for diseases that could cause bloody discharge. This research could help to identify genetic risk factors early on and develop targeted preventive measures in the future.

Another significant area of research focuses on the role of the vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients. microbiome. Researchers are analyzing how different bacterial populations and their balance affect the health of the vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. mucosaMucosa, also called mucous membrane, refers to the moist lining of body cavities that are connected to the outside world, such as the mouth, nose, lungs, and gastrointestinal tract. It serves to protect and facilitate the absorption of nutrients.. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results suggest that an imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. in the microbiome can not only promote infections but also triggerA trigger is a stimulus that elicits a specific reaction or state. In veterinary medicine, this can refer to emotional responses, such as fear or aggression, or medical conditions, such as seizures in dogs and cats. Inflammatory conditions and associated bloody discharge.

In addition, work is being done to improve diagnostic methods to identify bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge more quickly and accurately. The development of non-invasive techniques, such as high-resolution imaging techniques and specific biomarker tests, could revolutionize diagnostics and improve treatment outcomes. Such innovations could help veterinarians quickly distinguish between harmless and serious causes.

Another focus of research is on the development of new therapeutic approaches. Scientists are investigating the effectiveness of phytotherapeutics and probiotics to combat Inflammatory conditions and infections that cause bloody discharge. These treatments could serve as a supplement or alternative to conventional antibiotics and hormonal treatments, which is particularly important in view of increasing antibiotic resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins..

In addition, there are comprehensive studies dealing with the effects of environmental factors and nutrition on the incidenceIncidence refers to the number of new cases of a disease or condition that occur within a specific time period in a specific population group. It provides information about the risk of contracting the disease. of bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge in dogs. InitialInitial means beginning or at the start. In medicine, it can refer to the first symptoms of a disease or the first phase of a treatment process. results show that certain environmental toxins and nutritional deficiencies can increase the risk of inflammatory or 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. conditions that cause bloody discharge. In the long term, these findings could lead to new recommendations for keeping and feeding dogs in order to minimize the risk of such symptoms.

Finally, there is a growing branch of research that deals with the psychologicalPsychological refers to anything related to the mind or behavior. In veterinary medicine, this can include the study of animal behavior, including stress responses and behavioral disorders. and social components of bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge. Studies show that 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 psychologicalPsychological refers to anything related to the mind or behavior. In veterinary medicine, this can include the study of animal behavior, including stress responses and behavioral disorders. 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. in dogs can lead to hormonal imbalances, which in turn cause symptoms such as bloody discharge. These findings underscore the importance of a holistic approach to pet health that considers both physical and psychologicalPsychological refers to anything related to the mind or behavior. In veterinary medicine, this can include the study of animal behavior, including stress responses and behavioral disorders. aspects.

Frequently asked questions

What is bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge in dogs? Bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge in dogs is the presence of blood in the secretions from the vagina. It can have various causes and is not always a sign of a serious illness. Nevertheless, it should always be clarified by a veterinarian in order to determine the cause and treat it appropriately.
What are the common causes of bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge? Common causes of bloody Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge) in dogs are estrusEstrus, also known as heat, is the phase in the reproductive cycle of female mammals when they are receptive to mating. In dogs and cats, this is the time when they are ready to mate., uterine Inflammatory conditions (pyometra), vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. infections, traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries., and rarely also Tumors. A veterinarian can determine the exact cause through examinations.
How does bloody discharge during estrus differ from disease-related discharge? During estrusEstrus, also known as heat, is the phase in the reproductive cycle of female mammals when they are receptive to mating. In dogs and cats, this is the time when they are ready to mate., bloody discharge is normal and occurs at regular intervals. Disease-related discharge can occur irregularly, be accompanied by other symptoms, and indicate an underlying disease.
When should I take my dog to the vet? You should take your dog to the veterinarian if the bloody discharge is unusually heavy, lasts longer than usual, is accompanied by other symptoms such as Lethargy or loss of appetite, or if your dog is not in heat and still shows bloody discharge.
What diagnostic tests are performed to determine the cause? A veterinarian can perform various tests, including a physical examination, blood tests, 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. examinations, and possibly a vaginoscopyVaginoscopy is a diagnostic examination that uses an endoscope to visualize and examine the inside of the vagina. It can be used to diagnose infections, Tumors, and other abnormalities., to determine the cause of the bloody discharge.
Can bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge disappear on its own? Bloody Discharge from the vagina (vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge) that is related to estrusEstrus, also known as heat, is the phase in the reproductive cycle of female mammals when they are receptive to mating. In dogs and cats, this is the time when they are ready to mate. usually disappears on its own. However, if it is caused by a disease, treatment is necessary. Without treatment, the symptoms can worsen.
What treatments are available for bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge? The treatment depends on the cause. Hormonal therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. can be used for hormonal causes, antibiotics for infections, and surgery may be necessary for anatomical problems. Your veterinarian will recommend the best treatment for your dog.
Can I do anything to prevent bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge? Regular veterinary examinations, a balanced diet, and avoiding 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. can help reduce the risk of diseases that cause bloody discharge. In addition, spaying female dogs can help reduce the risk of certain diseases.
Is bloody vaginalVaginal refers to anything related to the vagina, the muscular tube that connects the external genitalia in female mammals to the uterus. discharge contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious. to other dogs? The discharge itself is not contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious., but the underlying cause could be contagiousContagious means infectious. Diseases that can easily be transmitted from one animal to another or from animals to humans are referred to as contagious., such as with certain infections. It is important to avoid direct contact with other dogs until the cause has been clarified.
How can I help my dog feel more comfortable? To help your dog with bloody discharge, you should offer him rest, a clean environment, and enough water. Avoid strenuous activities and make sure that he does not constantly Lecken himself, which could irritate the mucous membranes. A veterinarian can give you individual tips.