What Is Hyperkeratosis In Dogs?

What is Hyperkeratosis?

Keratin is a tough, fibrous protein that forms the outer layer of skin, nails, and hair. In healthy dogs, keratin production is a regulated process that maintains skin integrity. Hyperkeratosis disrupts this balance, resulting in an overabundance of keratin. This excess keratin accumulates, causing the skin to thicken and harden, often exhibiting a rough, cracked, or even hairy appearance.   

Causes of Hyperkeratosis in Dogs

Hyperkeratosis can arise from various factors, categorized broadly into primary (inherited) and secondary (acquired) causes.

Primary (Inherited) Hyperkeratosis

This form is often breed-specific and results from genetic predispositions.

• Examples include canine familial foot pad hyperkeratosis, which affects certain Irish Terriers and other breeds.

• It usually manifests early in life and tends to be progressive.

Secondary (Acquired) Hyperkeratosis

This is far more common and stems from underlying health conditions or environmental factors.

Common causes include:

• Zinc-responsive dermatosis – Occurs when a dog’s body struggles to absorb or utilize zinc properly, leading to skin abnormalities.

• Leishmaniasis – A parasitic disease transmitted by sandflies, which can cause skin lesions, including hyperkeratosis.

• Hypothyroidism – An underactive thyroid gland can disrupt skin cell turnover, resulting in hyperkeratosis.

• Autoimmune diseases – Conditions like pemphigus foliaceus can trigger abnormal keratin production.

• Environmental factors – Exposure to harsh chemicals, prolonged pressure on paws, or chronic irritation can contribute to hyperkeratosis.

• Certain cancers – Some skin cancers can present with hyperkeratosis-like symptoms.

• Vitamin A deficiency – Though much less common with balanced commercial diets, deficiencies can cause skin issues. Connect with a clinical dog nutritionist to address a potential Vitamin A deficiency.

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Symptoms and Diagnosis

Recognizing the signs of hyperkeratosis is essential for prompt veterinary intervention.

Common Symptoms:

• Thickened, hardened skin, particularly on the paw pads and nasal planum.

• Cracked or fissured skin, which can be painful and prone to infection.

• Rough, scaly, or hairy skin texture.

• Discomfort or lameness, especially when walking on affected paws.

• Bleeding from cracked skin.

• Infection of the affected areas.

• Nasal hyperkeratosis, which can cause breathing issues in severe cases.

Diagnosis Typically Involves:

• Physical examination – Assessing the affected areas and evaluating the dog’s overall health.

• Skin scrapings or biopsies – To rule out infections or other underlying conditions.

• Blood tests – To check for hormonal imbalances (e.g., hypothyroidism) or other systemic diseases.

• Zinc level testing – To determine if zinc-responsive dermatosis is present.

• Leishmaniasis testing – If the dog has a history of travel to endemic areas.

• Genetic testing – In cases suspected to be primary hyperkeratosis.

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Treatment and Management

Treatment for hyperkeratosis depends on the underlying cause and severity of the condition.

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Treatment Options:

• Addressing the underlying cause – Treating the primary condition, such as hypothyroidism or zinc deficiency, is crucial for managing secondary hyperkeratosis.

• Topical medications – Keratolytic agents, such as salicylic acid or propylene glycol, can help soften and remove excess keratin.

• Soaking and debridement – Soaking the affected areas in warm water softens hardened skin, allowing for gentle removal of excess keratin. A veterinarian may perform debridement to remove thick, overgrown keratin.

• Moisturizers and emollients – Applying moisturizing creams or ointments helps keep the skin hydrated and prevents cracking.

• Oral medications – In severe cases, oral retinoids or immunosuppressants may be prescribed.

• Dietary supplements – Zinc or vitamin A supplements may be recommended for specific deficiencies.

• Antibiotics or antifungals – If secondary infections occur, antibiotics or antifungals are necessary.

• Paw protection – Booties can shield affected paws from harsh surfaces and reduce discomfort.

• Regular trimming – Careful trimming of overgrown keratin can help prevent cracking and discomfort. This should be done by a professional or under close veterinary supervision.

• Laser therapy – In some cases, laser therapy has shown promise in reducing the amount of keratin produced.

Home Care and Prevention

Effective home care plays a vital role in managing hyperkeratosis.

Tips for Home Care:

• Regular inspection – Check your dog’s paws and nose for signs of thickening or cracking.

• Moisturizing – Apply veterinarian-recommended moisturizers to keep the skin hydrated.

• Gentle cleaning – Clean affected areas with mild soap and warm water, then pat dry thoroughly.

• Avoid harsh surfaces – Minimize exposure to rough or abrasive surfaces.

• Balanced diet – Ensure your dog receives a balanced diet to support skin health.

• Regular veterinary checkups – Schedule regular vet visits to monitor the condition and adjust treatment as needed.

Hyperkeratosis In Dogs

Managing hyperkeratosis can be challenging; however, with proper veterinary care and consistent home management, dogs can continue to lead comfortable and active lives. Moreover, early diagnosis and timely treatment play a crucial role in preventing complications while also enhancing your dog’s overall well-being.

About Petworks

In 2021, Dr. Marty Goldstein DVM joined the pet care platform Petworks as an advisor in its Animal Nutrition care division. Dr Marty Nature’s Blend is on a mission to help your pets live their healthiest lives possible. Dr. Marty’s pet nutrition expertise and guidance has helped Petworks evolve and become the preeminent animal and pet nutrition consultation service for pet parents in North America.

In 2022, Blue Buffalo Founder Bill Bishop Jr. joined Petworks as Senior Advisor in our Animal Nutrition Care Division. Bill brings his extensive expertise in pet food innovation and business leadership. His guidance helps Petworks enhance our pet nutrition service offerings, helping to ensure that pet parents throughout the world receive trusted, science-backed nutritional support for their dogs, cats, and animals.