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Crusting on the Skin in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.02.2026

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Crusting on the skin in dogs is a visible change in the skin’s surface, where hard, dry coatings form. These crusts can consist of dried exudateExudate is a fluid that leaks out of blood vessels and into nearby tissues, typically in response to inflammatory conditions. It contains high concentrations of proteins, cells, or solid materials, unlike a transudate, which is a clear, low-protein fluid. Exudates can help with a diagnosis of disease processes., blood, serumSerum is the liquid part of the blood that remains after coagulation. It does not contain blood cells or coagulation factors, but many other proteins, antibody and electrolytes. Serum is used in diagnostics for a variety of blood tests., or dead skin cells and are often a sign of an underlying dermatological or systemic disease.

Can Occur with the Following Diseases:

Basics and possible causes

The skin is the largest organ in the body and acts as a barrier against external influences. In dogs, the skin can be damaged due to various causes, leading to crusting. One of the most common causes are skin infections 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., fungi, or parasites. Bacterial infections, such as pyoderma, often occur 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 damaged or irritated skin areas.

Fungal infections, such as dermatophytosis (also known as ringworm), can also lead to crusting. These infections are caused by the infestation of the upper layers of the skin by fungal spores and lead to redness, itching, and subsequent formation of crusts.

Parasites such as fleas, lice, or mites (e.g. in the case of mange) are also common triggers of skin irritation and crusting. ParasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infestation leads to intense itching, causing dogs to scratch and bite, which further damages the skin and promotes infections.

Allergies are another significant cause of skin problems. Dogs can be allergic to various environmental factors, foods, or insect bites. These allergies cause an overreaction 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., which can lead to inflammatory conditions and crusting.

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 body’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 skin cells, can also cause crusts to form. Examples include pemphigus foliaceus and lupus erythematosus.

Finally, hormonal imbalances, such as those that occur with hypothyroidism, can impair skin health and promote crusting.

Typical accompanying symptoms

Itching: Dogs suffering from crusting often show intense scratching or biting at the affected areas. This can further irritate the skin and lead to secondary infections.
Redness: The affected skin areas may appear red, indicating an inflammatory condition or irritation.
Hair loss: In connection with crusting, there may be local or generalizedGeneralized means that a disease or condition affects a large part of the body or multiple organ systems. Generalized diseases can show systemic symptoms and may require more comprehensive treatment. hair loss, especially if the dog scratches frequently.
Swelling: In some cases, the affected skin areas may be swollen, indicating a deeper 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 allergic reaction.
Odor: Infected or inflamed skin can 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..
Pain: In the case of deeper or more extensive skin lesions, dogs may show pain, especially when the affected areas are touched.

When to visit the vet?

A visit to the vet is urgently needed if the crusting is accompanied by severe itching, bleeding, or discharge, 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 other underlying condition. Even if the dog shows pain or its general condition deteriorates, a veterinarian should be consulted as soon as possible.

Another reason to visit a veterinarian is if the crusting does not heal within a few days despite home care or even worsens. ChronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. or recurrentRecurrent refers to a disease that repeatedly returns or worsens after a temporary remission or improvement. skin problems may require a comprehensive diagnostic evaluation.

If a parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infestation is suspected or if there are known allergies, early veterinary care is important to avoid complications and relieve itching.

Symptom recognition for animal owners and veterinary diagnostic procedures

It is important for the pet owner to regularly inspect the dog’s skin, especially if the dog scratches frequently or behaves uncomfortably. Signs such as redness, swelling, hair loss, or unpleasant odor should be taken seriously.

The veterinarian will first perform a thorough clinical examination to assess the dog’s general health. A precise 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. is crucial to identify possible triggers. Questions will be asked about diet, environmental factors, recent changes in the living environment, or known allergies.

For further clarification, skin scrapings, biopsies, or microbiological cultures can be taken to diagnose infections or parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. diseases. Blood tests can provide information about the presence of 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 hormonal imbalances.

In some cases, an allergy testAn allergy test is a method for the diagnosis of allergic reactions. The body is exposed to various allergens to identify which substances trigger an allergic reaction. may also be necessary to identify specific triggers and treat them in a targeted manner.

What can pet owners do and professional therapy options

Immediate relief of symptoms includes measures to prevent further damage. This includes wearing a neck collar to prevent scratching and biting, as well as gently cleaning the affected skin areas with antiseptic solutions to prevent infections.

A balanced diet rich in essential fatty acids and vitamins can support skin health. Dietary supplements with omega-3 and omega-6 fatty acids can have an anti-inflammatory effect and promote the healing process.

It is important to keep the dog’s coat clean and dry. Regular brushing removes loose hair and dander and can help keep the skin healthy.

Avoid using irritating shampoos or care products that could further dry out or irritate the skin. In the case of parasiticParasitic refers to diseases or conditions caused by parasites. Parasitic infections can affect the digestive tract, skin, and other organ systems. infections, appropriate agents for flea or mite control should be used to control the infestation.

In any case, veterinary treatment should be sought to determine the exact cause of the crusting and to initiate targeted 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.. Only through an 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. and appropriate treatment can long-term damage be avoided and the dog’s quality of life be improved.

Outlook on current research

Crusting on the skin of dogs is a common symptom that worries many dog owners. Current research is investigating various aspects of this symptom, including the underlying pathologicalPathological refers to anything related to diseases or their processes. Pathological changes are those that deviate from the normal structure or function and indicate a disease. mechanisms, genetic predispositions, and the effects of environmental factors. A key focus is on examining the skin barrier function in dogs. Researchers are analyzing how a weakened skin barrier leads to an increased susceptibility to infections and irritations, which in turn can cause crusting. By examining the structure and function of the skin barrier at the molecular level, scientists hope to develop new therapeutic approaches that can improve skin health in dogs.

Another area of current research focuses on the role of allergies and 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 crusting. Studies show that allergens and autoantibodies can trigger an 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. that damages the skin and leads to inflammatory conditions, resulting in crusting. Researchers are investigating the specific 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. in dogs responds to such stimuli in order to develop targeted treatment strategies that can modulate 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.. This could help reduce the frequency and severity of crusting in allergic or autoimmune skin diseases.

In addition, the role of 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. and yeasts on the skin of dogs as potential causes of crusting is being intensively researched. The skin of dogs harbors a variety of microorganisms known as skin flora. An imbalanceImbalance refers to an imbalance or disruption of normal function or composition in the body, which can lead to health problems. in this flora, often referred to as dysbiosis, can lead to skin problems. Researchers are analyzing how changes in the composition of the skin flora can contribute to crusting and whether probiotic or antimicrobialAn antimicrobial substance is an agent that serves to inhibit the growth of microorganisms such as bacteria, viruses, fungi, and protozoa, or to kill them. Antimicrobials are frequently used to treat infections. treatments are effective in correcting this dysbiosis and improving skin health.

Technological advances in imaging and analysis allow researchers to examine the microscopic changes in the skin in more detail. High-resolution imaging techniques and molecular analysis methods are used to better understand the structural and functional changes in the skin of dogs with crusting. These technologies enable a more precise 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 help to evaluate the effectiveness of new treatments by making the changes in the skin visible before and after 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..

Research into crusting on the skin of dogs continues to evolve, with the goal of improving the quality of life of affected animals. Through interdisciplinary approaches that integrate dermatologyDermatology is the branch of medicine that deals with the structure, function, and diseases of the skin. It includes the diagnosis and treatment of skin, hair, and nail disorders., immunology, and microbiology, scientists hope to develop more comprehensive and effective treatment strategies. This research has the potential not only to expand the treatment options for dogs with skin problems, but also to deepen our understanding of skin health in general.

Frequently asked questions

What causes crusting on my dog’s skin? Crusting can be caused by a variety of factors, including infections, allergies, parasites, and 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.. It is important to have the exact cause determined by a veterinary examination.
Can certain breeds be more prone to crusting? Yes, some breeds are more prone to skin problems that can lead to crusting, such as English Bulldogs, Shar Peis, and West Highland White Terriers. These breeds often have genetic predispositions that make their skin more sensitive.
How can I tell if my dog is suffering from an allergic reaction? Signs of an allergic reaction can be itching, redness, swelling, and crusting. An allergy test at the vet can help identify specific allergens that are causing a reaction.
Are home remedies safe for treating crusts on my dog’s skin? Some home remedies can provide relief, but it’s important to talk to a vet before using them to make sure they’re safe for your dog and don’t worsen the underlying cause of the crusting.
Can parasites like fleas and mites cause crusting? Yes, parasites like fleas and mites can cause skin irritations that lead to crusting. Regular 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. prophylaxisProphylaxis refers to preventive measures taken to avoid diseases or health problems. In veterinary medicine, this can include vaccinations, regular deworming, and other preventive treatments. can help prevent such problems.
How is crusting diagnosed in dogs? 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. usually includes a thorough physical examination, skin tests such as smears or biopsies, and possibly blood tests to determine the underlying cause.
Can 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. cause crusting in dogs? 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. alone does not usually cause crusting, but it can worsen existing skin problems. It is important to minimize stressors and provide your dog with a calming environment.
What treatment options are available for crusting in dogs? The treatment depends on the cause and may include medications such as antibiotics, antihistaminesAntihistamines are medications that block the effects of histamine in the body, thereby alleviating allergic reactions. They are used in dogs and cats to treat Itching, Skin inflammation, and other allergy symptoms., or steroidsSteroids are a group of lipids that include both hormones and certain medications. In veterinary medicine, steroids are used to treat inflammatory conditions, allergies, and autoimmune diseases in dogs and cats.. A change in diet or special skin care may also be necessary.
Can dietary changes help reduce crusting? Yes, a balanced diet rich in essential fatty acids and vitamins can improve skin health and reduce susceptibility to skin problems.
How can I prevent future crusting in my dog? Regular grooming, a balanced diet, 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. control, and avoiding allergens can help maintain skin health and reduce the risk of crusting.