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Ulcerative skin lesions in Dogs

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

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UlcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions, also known as ulcerations, are open wounds on a dog’s skin surface. They occur when the skin layers are damaged or destroyed, leading to tissue loss. These lesions can vary in shape and size and are typically characterized by inflammation, redness, and fluid discharge.

Can Occur with the Following Diseases:

Grundlagen und mögliche Ursachen

The skin is the largest organ of a dog and serves as a protective barrier against external influences. Ulcerations develop when this barrier is breached, usually as a result of inflammatory conditions, infections, or other medical conditions. The causes of ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions in dogs are diverse and can be both internal and external.

A common cause of ulcerations is bacterial infections. When 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. penetrate the skin, they can cause inflammatory conditions and tissue damage. Fungal infections, such as those caused by dermatophytes, can also lead to ulcerations, especially if the dog’s 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. is weakened.

Allergic reactions are another common cause of skin ulcers. Dogs can react to a variety of allergens, including insect bites, pollen, or certain foods. These allergic reactions often lead to intense itching, which can result in excessive scratching and ultimately skin ulcerations.

Autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus. can also cause ulcerations. In these conditions, the dog’s 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 body tissue, leading to skin damage. Examples include Pemphigus or Lupus Erythematosus.

Physical traumas, such as bite wounds or abrasions, can also cause ulcerations. Such injuries allow 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. to penetrate the skin and cause infections.

Finally, systemic diseases, such as kidney or liver diseases, can also impair skin health and lead to ulcerations. These diseases can weaken 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. or lead to an accumulation of toxins in the body that attack the skin.

Typische Begleitsymptome

Redness and Swelling: Ulcerations are often accompanied by significant redness and swelling of the surrounding skin, indicating an inflammatory reaction.
Itching: Many dogs show intense itching at the affected site, which can lead to further scratching and potential secondary infections.
Pain sensitivity: The area around the ulcerationAn ulceration is an open wound or sore, typically on the skin or mucous membranes, characterized by the loss of surface tissue. Ulcerations in dogs and cats can be caused by infections, chronic inflammatory conditions, or cancer. can be painful, which may manifest as the dog avoiding touch in that area or reacting with discomfort.
Fluid discharge: Ulcerations can discharge fluid, which may be clear, purulentPurulent refers to pus or the production of pus, which may indicate a bacterial infection. Purulent inflammatory conditions are often painful and may have significant swelling and redness., or bloody, depending on the severity of 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. or inflammatory condition.
Odor formation: In severe infections, the affected skin may develop an unpleasant odor, indicating 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..
Behavioral changes: Dogs with painful ulcerations may show signs of discomfort or 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., such as increased panting, restlessness, or decreased activity.

Wann zum Tierarzt?

A veterinary visit is required if the ulcerations do not heal within a few days or worsen. Special attention is needed if the lesions affect a large area or are deep, as this may indicate a serious 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 an underlying disease.

If the dog shows signs of severe pain, fever, or general malaise, a veterinarian should be consulted immediately. These symptoms may indicate a systemic 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 another serious illness.

Even if the ulcerations are accompanied by other symptoms, such as vomiting, diarrheaDiarrhea refers to the condition of frequent, watery bowel movements, which can be a sign of infections, digestive disorders, or other health problems., or loss of appetite, a veterinary visit is advisable. These symptoms may indicate a systemic disease that requires treatment.

Symptomerkennung für den Tierhalter und tierärztliches diagnostisches Vorgehen

For pet owners, it is important to regularly check the dog’s skin to detect early signs of ulcerations. This includes feeling the fur and skin for irregularities and observing the dog’s behavior, especially if it frequently scratches or licks.

During the veterinary visit, the veterinarian will conduct a thorough examination of the dog. This may include an assessment of the skin lesions, followed by diagnostic tests such as skin swabs, biopsies, or blood tests to determine the exact cause of the ulcerations.

Skin swabs can be used to identify 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. or fungi, while biopsies can help rule out an autoimmune disease or a tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Blood tests provide information about the dog’s general health and can give clues about systemic diseases.

Was kann der Tierhalter tun und professionelle Therapieoptionen

Until the veterinary examination, pet owners can try to keep the affected area clean and dry to prevent symptoms from worsening. This involves gently cleaning the wound with a mild antiseptic solution to reduce 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..

It is important to prevent the dog from licking or scratching the ulcerationAn ulceration is an open wound or sore, typically on the skin or mucous membranes, characterized by the loss of surface tissue. Ulcerations in dogs and cats can be caused by infections, chronic inflammatory conditions, or cancer., as this can hinder wound healingWound healing is the natural process of repairing tissue damage, occurring in phases including inflammation, tissue regeneration, and wound contraction, to restore tissue integrity.. A protective collar can be helpful here to prevent access to the affected area.

Avoid applying home remedies or non-prescription ointments without consulting a veterinarian, as these can worsen symptoms or be unsuitable for dogs. Veterinary treatment is essential to address the cause of the ulcerations and ensure adequate 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..

Ausblick auf aktuelle Forschung

Research into ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions in dogs focuses heavily on identifying the molecular and genetic mechanisms that cause these symptoms. Scientists are investigating how specific genes and proteins in a dog’s body react to 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., infections, or injuries, and how these reactions can lead to ulcerations. By using modern genetic analysis methods, researchers can identify specific gene mutations that may increase the risk of developing skin ulcers. These findings could contribute to the development of targeted therapies that directly address the molecular causes in the future.

Another important area of research deals with 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 ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions. Researchers are investigating how a dysregulation 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. can lead to inflammatory conditions and ultimately to ulcerations. In particular, research is being conducted into how autoimmune reactions, in which 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. attacks its own cells, can impair skin health. These studies are crucial for developing new therapeutic approaches aimed at modulating 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. to prevent or treat the formation of ulcers.

The development of new diagnostic methods that enable early detection of ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions is also a central research topic. Scientists are currently working on improving imaging techniques and developing non-invasive tests that allow for quick and accurate 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.. These efforts could enable veterinarians to respond more effectively and quickly to symptoms, significantly improving treatment outcomes for affected dogs.

A newer research approach investigates the role of environmental factors and their influence on the development of skin ulcers. Researchers analyze how environmental conditions, such as air pollution, UV radiation, or chemical influences, can affect skin integrity. The aim of these studies is to develop preventive measures that minimize the risk of ulcerations. This could be achieved through the introduction of specific care products or changes in the dogs’ living environment.

Finally, the research into new therapeutic approaches for the treatment of ulcerations is of great importance. Various research groups are testing innovative treatment strategies, including the application of stem cells, the use of growth factors, and the development of new ointments and creams that promote wound healingWound healing is the natural process of repairing tissue damage, occurring in phases including inflammation, tissue regeneration, and wound contraction, to restore tissue integrity.. These innovative approaches have the potential to significantly shorten healing time and considerably improve the quality of life for dogs with ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions.

Häufig gestellte Fragen

What are the most common causes of ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions in dogs? UlcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions can be triggered by a variety of factors, including infections, autoimmune diseasesAutoimmune diseases are conditions in which the immune system mistakenly attacks the body's own cells or tissues as if they were foreign substances. Examples in dogs and cats include autoimmune hemolytic anemia and systemic lupus erythematosus., parasites, allergies, and physical injuries. It is important to identify the exact cause to ensure effective treatment.
Are ulcerations in dogs painful? Yes, ulcerations can be very painful for dogs. They often cause discomfort, itching, and can be sensitive to touch. Timely veterinary treatment can help relieve pain and promote healing.
How are ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions diagnosed in dogs? 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. is usually made through a comprehensive physical examination, supplemented by specific tests such as skin biopsies, blood tests, and microbiological cultures. These help identify the underlying cause.
Can ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions be cured in dogs? In many cases, ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions can be successfully treated, especially if the underlying cause is identified and addressed. Treatment may include medication, topicalTopical refers to the direct application of medications or treatments to the skin or mucous membranes for a local effect, without being absorbed into the body. therapies, and lifestyle changes.
How can I help my dog at home if it has ulcerations? You can help your dog by keeping the affected areas clean, providing a comfortable resting place, and following the veterinarian’s instructions. Avoid touching or rubbing the ulcerations, as this can disrupt healing.
What role does nutrition play in the treatment of skin ulcers in dogs? A balanced diet can support the healing of skin ulcers by strengthening 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. and promoting skin health. It may be helpful to supplement the diet with specific nutrients important for skin regeneration.
Can skin ulcers in dogs be triggered by 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.? Yes, 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 be a 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. for skin problems in dogs, including ulcerations. 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 weaken 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. and worsen existing skin problems. 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. reduction can be an important part of the treatment.
Are there preventive measures against ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions? Regular care, a healthy diet, and parasiteA parasite is an organism that lives on or in another living being (the host) and feeds at its expense. Parasites can cause a variety of diseases in animals and humans. preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. can reduce the risk of ulcerations. Additionally, known allergens should be avoided, and regular veterinary check-ups should be performed.
How long does it take for ulcerativeUlcerative refers to the condition or process that leads to the formation of ulcers. Ulcers are open Wounds or Lesions that can form on the skin or mucous membranes, are painful, and often heal slowly. skin lesions to heal in dogs? Healing time can vary greatly and depends on the cause, severity of the ulcerations, and effectiveness of the treatment. Some ulcers may heal within a few weeks, while others take longer.
Do dogs with ulcerations always need to see a veterinarian? Yes, it is important to consult a veterinarian if your dog develops ulcerations. Professional 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. and treatment are crucial to avoid complications and ensure the best possible care.