Cornifying Epitheliomas in Dogs: Causes, Symptoms, and Treatment Options

Cornifying epitheliomas, also known as keratoacanthomas or infundibular keratinizing acanthomas, are benign skin tumors that commonly affect middle-aged dogs. These tumors are characterized by tough, layered lumps that protrude from the skin and can resemble small horns. While generally harmless, they may cause discomfort or lead to complications if left untreated. This article explores the causes, symptoms, and treatment options for cornifying epitheliomas in dogs.

What Are Cornifying Epitheliomas?

Cornifying epitheliomas are benign tumors that typically arise from hair follicles. These growths form nests of tough, layered lumps on the skin, which may look like small horns or cornified cysts. They can develop anywhere on the dog’s body but are most frequently found on the back, tail, and legs. In some cases, these tumors may cause irritation, leading to scratching or biting, which can result in secondary infections or skin trauma.

Breeds at Risk for Cornifying Epitheliomas

Certain dog breeds are more prone to developing cornifying epitheliomas. Middle-aged dogs are particularly susceptible, and specific breeds at higher risk include:

• Norwegian Elkhounds
• Belgian Sheepdogs
• Lhasa Apsos
• Bearded Collies

Norwegian Elkhounds and Lhasa Apsos are particularly at risk for developing multiple tumors or a more widespread form of the disease.

Symptoms of Cornifying Epitheliomas

The primary symptom of cornifying epitheliomas is the presence of tough, horn-like tumors on the skin. These tumors can vary in size and may cause discomfort depending on their location. Some key symptoms include:

• Raised, horn-like lumps: The tumors appear as tough, layered growths that stick up from the skin surface.
• Cornified cysts: In some cases, the tumors may appear as cornified cysts rather than horns.
• Self-trauma: Dogs may scratch, rub, or bite at the tumors, leading to trauma or ulceration.
• Secondary infections: If the tumors are irritated or broken open, they can become infected.

Causes of Cornifying Epitheliomas

While the exact cause of cornifying epitheliomas is not fully understood, they most likely originate from hair follicles. Genetic factors may play a role in certain breeds, especially those predisposed to the condition. Environmental factors such as skin irritation or trauma may also contribute to the development of these tumors.

Treatment Options for Cornifying Epitheliomas

Treatment for cornifying epitheliomas depends on the severity of the condition and whether the tumors are causing discomfort or complications. In some cases, the tumors may be left untreated if they are not causing any issues. However, treatment is recommended in cases of self-trauma, ulceration, or secondary infection.

• Surgical Removal: Surgical removal is the preferred treatment option, especially if the dog is experiencing discomfort or if the tumors are prone to infection. However, it’s important to note that dogs are likely to develop additional tumors over time.
• Oral Retinoid Medications: For dogs with a generalized form of the disease, oral retinoid medications may be prescribed to help manage the condition and reduce the occurrence of new tumors.
• Monitoring: In cases where the tumors are not causing any issues, regular monitoring is advised to ensure they do not worsen or lead to complications.

Cornifying epitheliomas are benign tumors that can cause discomfort and complications in dogs, particularly in certain breeds like Norwegian Elkhounds and Lhasa Apsos. While treatment is not always necessary, surgical removal is recommended in cases where the tumors lead to self-trauma or infection. With proper management, most dogs can live comfortably with this condition, although additional tumors may develop over time.