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Oral Crusting in Dogs

Author: Dr. med. vet. Gisa Löwe | Last modified: 20.02.2026

When to visit the vet?

Urgent see a veterinarian within 24 hours

RED in case of breathing/swallowing problems, excessive salivation, rapid facial swelling, significant ulceration/Bleeding, or suspected caustic injury/foreign body.

Unsure about what’s wrong with your pet? Feel free to use our Symptom Checker for more clarity

Definition

OralOral means “through the mouth” and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. crusting in dogs refers to the development of hardened areas or scabs on the skin around a dog’s mouth. This can be caused by various factors and is often a sign of an underlying condition or skin irritation.

Can Occur with the Following Diseases:

Basics and possible causes

A dog’s skin serves as a barrier against environmental factors and protects against 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.. When this barrier is disrupted, a variety of skin problems can occur, including crusting. The oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. region is particularly vulnerable because it is constantly exposed to environmental irritants, moisture, and mechanical 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..

A common cause of oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. crusting is a bacterial or fungal 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.. Skin infections can occur when the skin’s natural barrier is weakened by scratches, bites, or other injuries. Excessive licking or scratching due to itching can also damage the skin and promote infections.

Allergies are also a common cause of skin problems in dogs. Allergic reactions can be triggered by food, environmental allergens such as pollen or house dust mites, as well as contact allergens. These allergens can lead to inflammatory conditions and irritation, which eventually lead to crusting.

Parasites such as fleas, mites, or ticks can also cause skin irritation and crusting. These parasites not only cause direct damage through bites, but 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. allergic reactions and serve as vectors for 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.

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. mistakenly attacks the body’s own cells, can also cause skin problems, including crusting. Lupus erythematosus and pemphigus are examples of such diseases that can cause skin lesions and crusting.

Typical accompanying symptoms

Redness and swelling: The skin around the mouth may appear red and swollen, indicating inflammation.
Itching: The dog may show increased scratching or rubbing of the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. region, indicating intense itching.
Hair loss: Hair loss can occur in the affected region, often accompanied by bald spots.
Pain: The dog may show signs of discomfort or pain, especially when touching the affected areas.
Unpleasant odor: Infections can cause an unpleasant odor that is noticeable from the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. region.
Changes in eating behavior: The dog may eat less or have difficulty chewing if the oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. region is painful.

When to see a vet?

A visit to the vet is essential if the crusting is accompanied by other symptoms such as fever, lethargy, or a rapid deterioration in general condition. These signs may indicate a serious systemic disease.

If the crusting does not subside or worsens within a few days despite home care, a veterinarian should also be consulted. 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 worsening skin problems may indicate an underlying condition that requires professional treatment.

Immediate veterinary assistance is required if there are signs of a possible allergic reaction, such as swelling in the face or respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress.

Symptom recognition for the pet owner and veterinary diagnostic procedure

It is important for the pet owner to pay attention to changes in skin texture, the dog’s behavior, and accompanying symptoms. Careful observation helps to assess the severity of the problem and prepare for the vet visit.

The veterinarian will first take a detailed 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. to identify possible triggers or pre-existing conditions. This is followed by a thorough physical examination to assess the condition of the skin and any possible systemic signs.

Various tests can be carried out for 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., including skin scrapings to identify parasites, cultures to isolate 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, and blood tests to check for allergic or autoimmune causes.

In some cases, 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. of the affected skin may be necessary to make 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., especially if 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 complex skin problems are suspected.

What the pet owner can do and professional therapy options

As a first step, affected dogs should be kept away from potential sources of irritation to prevent further deterioration. This may mean restricting access to certain environments or materials 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. allergic reactions.

The oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. region should be kept clean and dry. Gently cleaning with mild soap and water can help remove superficial irritants 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. agents. It is important not to rub the affected skin too hard to avoid further damage.

A neck collar or protective collar can be useful to prevent the dog from licking or scratching the affected area. This can help support the healing process and prevent further injury.

It is important not to use human medicines or creams without veterinary approval, as some substances can be harmful to dogs. The veterinarian can prescribe appropriate medications or 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. treatments that are specifically designed for use in dogs.

Outlook on current research

Oral crusting in dogs is a symptom that can indicate various underlying health problems. Research in this area strives to understand the biological processes that lead to crusting, examining the role of infections, immune responses, and skin diseases. One focus is on identifying specific microorganisms that contribute to this symptomatologySymptomatology refers to the entirety of symptoms associated with a particular disease or condition. It describes how a disease manifests itself externally., such as 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 viruses. Through genome sequencing and microbiological cultures, scientists are trying to isolate the most common pathogenic agents in order to develop more targeted treatment methods.

Another important area of research is the investigation of the dog’s 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. to various stimuli that can lead to crusting. This involves exploring how 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. responds to skin irritation and which inflammatory mediators play a role. By analyzing tissue samples and blood tests, researchers are trying to decipher the molecular mechanisms that lead to the development of crusts. These findings can help develop new therapeutic approaches that regulate the excessive 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 addition, the genetic predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. of dogs to oralOral means "through the mouth" and refers to the intake of food, medication, or other substances through the mouth. In veterinary medicine, many treatments are administered orally. crusting is being investigated. Genetic studies aim to identify specific gene variants that may increase the risk of skin diseases. This research could lead to predictive genetic testing in the future, which would make it possible to identify at-risk dogs early and take preventive measures. The findings from these studies could also contribute to breeding healthier dog breeds by minimizing genetic risk factors.

Another research approach focuses on the environmental factors that can contribute to crusting. This involves investigating how diet, allergens, and pollution affect the skin health of dogs. Studies are trying to establish links between certain dietary components or environmental toxins and the occurrence of skin symptoms. This could lead to recommendations on how targeted nutrition and environmental influences can reduce the risk of crusting.

Clinical research also focuses on the development and improvement of treatment methods. This includes investigating the effectiveness of new 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. and systemic medications used to treat inflammatory skin conditions. Clinical studies are also testing alternative therapeutic approaches, such as the use of probiotics, to alter the skin’s microbiome and thus alleviate symptoms. The results of these studies could help expand and improve treatment options for affected dogs.

Frequently asked questions

1. What causes oral crusting in dogs?

Crusting can be caused by a variety of factors, including infections, allergies, skin diseases, or injuries. It is important to determine the exact cause through a veterinary examination.

2. Are certain dog breeds more prone to crusting?

Yes, some dog breeds are more susceptible due to genetic predispositions or certain skin characteristics. Breeds with wrinkles or sensitive skin, such as bulldogs or Shar Peis, may be more frequently affected.

3. How is crusting diagnosed?

Diagnosis is usually made through a comprehensive clinical examination, the dog's medical history, and sometimes through laboratory tests such as skin smears, biopsies, or allergy tests.

4. Can crusting in dogs go away on its own?

In some cases, mild crusting may heal on its own, especially if it was caused by a minor injury. However, veterinary treatment is required for persistent or severe symptoms.

5. What treatment options are there?

The treatment depends on the underlying cause. It may include topical ointments, antibiotics, antifungals, or antihistamines. For allergies, diets or environmental adjustments may also be necessary.

6. Can I prevent crusting in my dog?

Prevention can be achieved through regular grooming, a balanced diet, and avoiding known allergens or irritants. Regular veterinary check-ups also help to identify problems early.

7. How long does it take for crusts to heal?

The healing time varies depending on the cause and severity. Mild cases may improve within days, while more severe cases may take weeks or longer.

8. Should I remove the crusts myself?

It is not recommended to remove crusts yourself, as this can lead to further injury or infection. Have the crusts examined and treated by a veterinarian.

9. Can crusting and itching occur together?

Yes, crusting is often accompanied by itching, especially if there is an allergic reaction or an infection. Itching can make the situation worse, as scratching can further damage the skin.

10. When should I take my dog to the vet?

You should see a veterinarian if the crusting occurs suddenly, worsens, is accompanied by other symptoms such as fever or loss of appetite, or if the symptoms persist for more than a few days.