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Panniculitis (Inflammation of Subcutaneous Fat) in Dogs

Occurrence: rarer
Location of disease: Skin/Fur

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

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

Definition

Panniculitis is an inflammatory condition that affects the subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue in dogs. This inflammation can be triggered by various causes and leads to palpable lumps or swelling under the skin.

The most important facts at a glance

Panniculitis in dogs is an inflammation of the subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue, which lies directly beneath the skin and consists of fat cells. This tissue layer serves as an energy reservoir, insulator, and protective cushion for internal organs. The inflammation can be triggered by various factors such as traumas, 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., or foreign body reactions. In some cases, the cause remains unknown, and the condition is classified as idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms..

Typical symptoms are lumps in the skin that are firm and slightly movable, as well as local redness and pain. In severe cases, the lumps may ruptureA rupture is a tear or break in an organ or tissue. It can be caused by trauma, illness, or overextension, and often requires medical intervention. and release a yellowish, brownish, or bloody secretion. 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 made through clinical examination, supplemented by fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis. or biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions.. Blood tests and imaging procedures such as X-rayX-ray is an imaging technique that uses X-rays to create images of the inside of the body. It is often used to diagnose bone fractures, lung diseases, and other conditions. or 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. may be necessary to rule out other diseases.

Treatment depends on the cause: antibiotics or antifungals for infections and immunosuppressiveImmunosuppressive agents are medications or substances that specifically suppress the activity of the immune system. They are used in dogs and cats to treat autoimmune diseases, allergies, and to prevent rejection reactions after transplants. medications for autoimmune reactions. For foreign bodies or injuries, surgical removal of the affected tissue may be required. Pain relievers and anti-inflammatory medications alleviate symptoms. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is usually good with timely 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, but may require long-term care for idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms. or autoimmune panniculitis.

Research focuses on genetic predispositions, 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., and the development of new diagnostic and treatment methods. Advances in imaging diagnostics and molecular tests could enable earlier and more accurate diagnoses.

Causes

The subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue, also known as subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. adipose tissue, is a layer of tissue located directly beneath the skin and composed of fat cells. It serves as an energy reservoir, insulator, and protective cushion for internal organs and structures. Panniculitis occurs when this tissue is affected by an inflammatory response.

Various factors can 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. inflammation of the subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue. Common causes include traumas, 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., or reactions to foreign bodies. In some cases, the exact cause remains unknown, and the panniculitis is classified as idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms..

Traumas, such as bite wounds or blunt injuries, can damage the tissue and 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. an inflammatory response. Infections caused by bacteria, fungi, or parasites can also attack the adipose tissue. 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., in which 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. attacks its own tissue, can 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. panniculitis.

Symptoms

Very common symptoms:

Common symptoms:

Rare symptoms:

The most common symptoms of panniculitis in dogs are the formation of lumps or swelling under the skin. These lumps may feel soft or firm and vary in size. They are often painful and may enlarge or harden over time.

In addition to palpable lumps, dogs with panniculitis may exhibit hair loss and redness in the affected areas. In some cases, ulcers and 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. discharge may occur when the inflamed areas open.

Systemic symptoms, such as fever, lethargy, and loss of appetite, may also occur, especially when the inflammation is caused by an 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 systemic disease.

Diagnosis

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. of panniculitis begins with a thorough clinical examination by a veterinarian. The veterinarian will examine the dog’s skin for lumps, swelling, and other signs of inflammation. A complete 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., including information about previous injuries or illnesses, can also be helpful.

To confirm the diagnosis, fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis. or biopsy of the affected area may be performed. In fine-needle aspirationFine-needle aspiration is a minimally invasive diagnostic technique that uses a thin needle to extract cells or fluid from a tumor, lesion, or organ. This sample is then examined microscopically to make a diagnosis., a small amount of tissue is removed with a fine needle and examined under a microscope. A biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. provides a larger tissue sample for histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination to assess the type of inflammation and the presence 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. agents or signs of an autoimmune reaction.

Additional tests, such as blood work, X-rays, or 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., may be required to rule out or identify underlying systemic diseases.

Therapy

Treatment of panniculitis depends on the underlying cause. If an 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. is present, antibiotics or antifungals may be prescribed to combat the pathogens. For autoimmune causes, immunosuppressiveImmunosuppressive agents are medications or substances that specifically suppress the activity of the immune system. They are used in dogs and cats to treat autoimmune diseases, allergies, and to prevent rejection reactions after transplants. medications may be necessary to control the immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens..

In cases where panniculitis is caused by foreign bodies or traumatic injuries, surgical removal of the affected areas may be required. Removal of necrotic tissue and wound cleaning can help promote healing.

Pain relievers and anti-inflammatory medications can be used to alleviate symptoms and improve the dog’s comfort. Close monitoring by the veterinarian is important to assess treatment success and make adjustments if necessary.

Prognosis and follow-up care

The prognosis for dogs with panniculitis varies depending on the cause and severity of the condition. With early 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 appropriate treatment, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is generally good, especially when the cause can be identified and specifically treated.

Dogs with idiopathicIdiopathic refers to a condition or disease for which the cause is unknown. It is used when no clear external cause or underlying disease can be identified as an explanation for the symptoms. panniculitis or those caused by an underlying autoimmune disease may require long-term treatment. In some cases, the condition can become chronic, and recurring flare-ups require ongoing medical care.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of panniculitis can be difficult because the causes are diverse. Good general care and hygiene can help minimize the risk of infections and injuries. Regular veterinary examinations can help detect and treat underlying conditions early.

For dogs with known 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. or a tendency toward panniculitis, a special diet or adapted management may be necessary to support immune function and reduce inflammation.

It is also important to minimize potential hazards in the dog’s environment to avoid injuries that could 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. panniculitis. Monitoring the dog for signs of skin changes and early veterinary consultation can be crucial for effectively managing the condition.

Outlook on current research

Research on panniculitis in dogs is a continuously evolving field focused on identifying underlying causes, effective diagnostic methods, and innovative treatment options. Current studies are investigating genetic factors that could lead to increased susceptibility to panniculitis. Some research findings suggest that certain dog breeds may be genetically predisposed, indicating that a genetic component must be considered.

Another important area of research is 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 panniculitis. Since the disease is often associated with autoimmune reactions, scientists are investigating the mechanisms by 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 the subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue. These insights could lead to more targeted immunotherapies that control inflammation more efficiently.

Regarding diagnostic methods, there are advances in imaging techniques 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. imaging, which can help better localize and assess inflammation in the subcutaneousSubcutaneous means "under the skin." In medicine, it refers to the administration of drugs or the placement of implants directly under the skin. fat tissue. Additionally, molecular diagnostic tests are being developed to identify specific biomarkers characteristic of panniculitis. These tests could enable earlier and more 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. in the future.

In 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. development, intensive work is being done to improve the effectiveness and reduce the side effects of medications. New drugs that specifically target inflammatory processes are being clinically tested. Research into natural remedies and dietary approaches is also ongoing to expand treatment options and improve the quality of life for affected dogs.

In summary, research on panniculitis in dogs aims to better understand the disease and develop new strategies to combat it more effectively. Advances in genetic research, immunology, and medical imaging are making crucial contributions to expanding knowledge about this complex condition.

Frequently asked questions (FAQs)

What is Panniculitis in Dogs?

Panniculitis is an inflammation of the subcutaneous fat tissue in dogs that can lead to painful lumps or swelling under the skin. This inflammation can be caused by various factors such as infections, autoimmune diseases, or traumas. -

What symptoms occur with panniculitis?

The most common symptoms include painful lumps in the skin, redness, skin ulcers, and sometimes fever. The affected dog may also show lethargy and loss of appetite. In some cases, discharge of oil or blood from the affected areas may occur. -

How is panniculitis diagnosed?

Diagnosis is typically made through a combination of clinical examination, skin biopsy, and histopathological analysis of the affected tissues. Blood tests and imaging procedures may also be used to rule out other diseases. -

What treatment options are available for panniculitis?

The treatment depends on the underlying cause. It may include the administration of antibiotics, anti-inflammatory drugs, or immunosuppressants. Supportive care such as warm compresses and a balanced diet can also be helpful. -

Is panniculitis curable in dogs?

The curability of panniculitis depends on the cause. In some cases, the inflammation can be successfully treated and completely cured, while in others it may become chronic and require long-term treatment. -

Can all dog breeds be affected by panniculitis?

In principle, any dog breed can be affected by panniculitis, although some breeds may have a higher genetic predisposition. Further research is needed to better understand breed susceptibility. -

Are there preventive measures against panniculitis?

There is no specific prevention, but general care of the dog, including a healthy diet, regular exercise, and avoiding injuries, can reduce the risk. Protection against infections and avoiding stress can also be helpful. -

Can panniculitis be transmitted from dog to humans?

No, panniculitis is not contagious and cannot be transmitted from dog to human or from dog to dog. It is an inflammatory response specific to the affected dog. -

How long does the treatment of panniculitis take?

The duration of treatment varies depending on the severity of the condition and the dog's response to therapy. Some dogs may show significant improvement within a few weeks, while others require longer-term treatment. -

When should I see a veterinarian if I suspect panniculitis?

If you notice unusual skin changes, lumps, or other symptoms in your dog, you should see a veterinarian as soon as possible. Early diagnosis and treatment can help avoid complications and speed up the healing process.