TL;DR: A cutaneous horn is a benign keratin growth on your cat's paw pad that is usually not an emergency unless it causes pain, bleeding, or signs of infection. If your cat is limping or the growth looks inflamed, schedule a routine veterinary exam.
What is the hard, horn-like growth on my cat's paw?
If you have noticed a hard, nail-like protrusion growing from your cat's paw pad, it is likely a cutaneous horn. These growths are made of an accumulation of excess keratin, which is the same protein that makes up your cat's claws and hair. While they look strange, they are essentially just a localized overgrowth of skin cells.
Is a cutaneous horn on my cat’s paw pad a medical emergency?
- The urgency level for a cutaneous horn is Low, as these growths are typically benign and painless.
- Schedule a routine appointment with your veterinarian if the growth causes discomfort or limping while walking.
- Consult a professional if you notice bleeding, discharge, or a foul odor around the base of the growth.
- In rare cases, these growths can be associated with underlying conditions like Feline Leukemia Virus (FeLV) and require veterinary evaluation.
Why should I provide a photo of the growth for veterinary triage?
- A clear, well-lit photo allows a professional to check the base of the growth for inflammation or secondary infections.
- Visual assessments help differentiate a simple keratin horn from more serious masses, such as cysts or tumors.
- Providing a photo ensures your cat receives the most accurate triage advice and an appropriate long-term care plan.
Clinical Context (Merck Veterinary Manual)
In cats, papillomavirus infection can manifest as multiple discrete, erythematous, black or brown hyperkeratotic plaques and papules, sometimes presenting as raised keratin horns. These lesions are nonpruritic, and while ulceration is uncommon, they may progress to invasive squamous cell carcinoma. Such lesions are often seen in systemically ill or immunosuppressed cats and are believed to be virally induced. Treatment options include cryotherapy for local lesions and topical imiquimod to potentially slow progression. Familial footpad hyperkeratosis can also cause horn-like growths; severe cases lead to fissures, secondary infections, pain, and lameness, requiring symptomatic treatment with soaking, keratolytic and emollient treatments, and addressing any bacterial pyoderma.
Chapter: Dermatology, Oncology
Source: The Merck Veterinary Manual, 11th Edition (Page 947)