Dog Getting Warts: Causes, Treatment, and When to Worry

If you've noticed your dog getting warts—those small, rough, cauliflower-like bumps on their lips, eyelids, or paws—you're not alone. Canine viral papillomas, commonly called dog warts, are caused by the canine papillomavirus (CPV) and are one of the most frequently seen benign skin growths in veterinary practice. They're especially common in puppies under two years old and senior dogs with weakened immune systems. While most warts are harmless and resolve on their own, some growths that look like warts may actually be something more serious, which is why proper identification matters.

In this guide, we'll break down exactly what causes warts in dogs, how veterinarians diagnose them, what treatment options exist (including realistic costs), and the red flags that mean you should book a vet visit right away.

What Are Warts in Dogs?

Canine warts, technically known as viral papillomas, are benign epithelial tumors caused by species-specific strains of the canine papillomavirus. According to the Merck Veterinary Manual, these viruses target rapidly dividing skin and mucosal cells, causing them to proliferate into the characteristic raised, rough-surfaced growths.

There are several recognized types:

• Oral papillomas (CPV-1): The most common type, appearing on the lips, gums, tongue, and inside the mouth. Primarily affects puppies and young dogs.
• Cutaneous viral papillomas: Found on the skin surface—legs, abdomen, eyelids. More common in older dogs.
• Cutaneous inverted papillomas: Grow inward rather than outward, often on the abdomen. Typically seen in young adult dogs.
• Pigmented viral plaques: Flat, dark growths linked to specific papillomavirus strains, sometimes seen in breeds like Pugs and Miniature Schnauzers.

The virus spreads through direct contact with an infected dog or contaminated objects (toys, water bowls, grooming tools). However, it is species-specific—dogs cannot transmit papillomavirus to humans, and human warts cannot infect dogs.

Symptoms of Warts in Dogs: What to Watch For

The symptoms vary depending on wart type and location. Here's a checklist organized by severity to help you monitor your dog.

The incubation period for canine papillomavirus is typically 1 to 2 months after exposure. Warts often appear suddenly and may multiply quickly over a period of several weeks before stabilizing.

Which Dogs Are at Risk? Breed Predispositions and Factors

It's worth noting that any dog can develop warts regardless of breed. The virus is widespread in the canine population, and exposure is nearly inevitable for socially active dogs. Whether a dog develops visible warts depends largely on their immune system's ability to suppress the virus.

Brachycephalic breeds like Pugs and Bulldogs deserve special attention—warts in the mouth or lip folds can be harder to spot due to their facial structure, and the warm, moist skin folds create an environment where secondary infections can develop alongside warts.

How Veterinarians Diagnose Warts in Dogs

While many canine warts have a distinctive appearance, your veterinarian won't rely on visual inspection alone—especially if the growth is unusual in appearance, rapidly growing, or located in a concerning area. Here's the typical diagnostic process:

In most straightforward cases—especially oral warts in a young puppy—your vet may diagnose based on clinical appearance and history alone, making the total cost as low as a standard exam fee. The American Kennel Club notes that the classic cauliflower-like appearance in a puppy's mouth is usually sufficient for a presumptive diagnosis.

Treatment Options: Medical, Surgical, and Supportive

The good news: most canine warts are self-limiting. In healthy dogs, the immune system typically clears the virus and warts regress on their own within 1 to 3 months. However, treatment may be necessary when warts are numerous, causing discomfort, interfering with eating, or persisting beyond the expected timeframe.

Important: Never attempt to treat your dog's warts with over-the-counter human wart removers. Products containing salicylic acid or other caustic agents are toxic to dogs and can cause chemical burns, oral ulceration, or systemic poisoning if ingested. Always consult your veterinarian before applying any treatment.

Supportive Home Care

While waiting for warts to resolve or recovering from treatment, these management strategies help:

• Soft food: If oral warts make eating painful, soak kibble in warm water or switch to a canned diet temporarily
• Separate bowls and toys: Prevent spread to other household dogs by keeping the affected dog's items separate and washing them daily with a dilute bleach solution (1:32 ratio)
• E-collar (cone): If your dog is scratching or pawing at warts, an Elizabethan collar prevents secondary bacterial infection from self-trauma
• Avoid dog parks and group settings: Keep your dog away from other dogs until warts have fully resolved to prevent transmission
• Monitor for changes: Photograph warts weekly with a ruler or coin for scale to track growth or regression objectively

Prognosis and Life Expectancy

For the vast majority of dogs, the prognosis with canine viral papillomas is excellent. These are benign growths that do not shorten a dog's life expectancy. Here's how outcomes vary by scenario:

Malignant transformation of a papilloma into squamous cell carcinoma is extremely rare but has been documented, particularly in older dogs with long-standing cutaneous warts. This is one reason your veterinarian may recommend biopsy of any wart that changes in character, grows rapidly, or fails to regress.

Cost Breakdown: What to Budget

Treatment costs depend heavily on the number of warts, their location, and the approach your veterinarian recommends. Here's a realistic budget framework:

Most standard pet insurance policies cover wart diagnosis and treatment if the condition develops after the policy's effective date. Check your policy's terms regarding dermatological conditions and whether there are per-incident or annual limits.

Prevention Strategies

Because canine papillomavirus is so widespread and spreads through casual contact, complete prevention is difficult. However, you can reduce risk:

• Support immune health: Feed a complete and balanced diet meeting AAFCO nutritional standards; maintain regular veterinary wellness exams
• Limit exposure during high-risk periods: Avoid dog parks, daycare, and group training classes for puppies under 6 months whose immune systems are still developing
• Quarantine affected dogs: If one dog in your household has active warts, keep them separated from other dogs and don't share bowls, toys, or grooming tools
• Sanitize shared items: Wash communal water bowls, toys, and bedding regularly; papillomavirus can survive on surfaces for short periods
• Avoid immunosuppressive medications when possible: Work with your vet to find the lowest effective dose of any necessary immunosuppressive drugs

There is currently no commercially available vaccine specifically for canine papillomavirus in the United States. Autogenous vaccines (made from the dog's own wart tissue) are used therapeutically rather than preventively.

When to See the Vet Immediately

Remember, the safest approach is to have any new growth on your dog evaluated by a veterinarian. While the odds favor a benign wart—especially in young dogs—only a professional examination and, when indicated, diagnostic testing can confirm the diagnosis with certainty.

Frequently Asked Questions

Can I catch warts from my dog?

No. Canine papillomavirus is species-specific and cannot infect humans. Similarly, human warts cannot be transmitted to dogs. The viruses that cause papillomas have evolved to target specific host species.

Will my dog's warts go away on their own?

In most healthy dogs, yes. Oral papillomas in puppies typically regress within 4 to 12 weeks as the immune system mounts a response. Cutaneous warts in older dogs may persist longer or indefinitely but usually remain benign. If warts haven't shown signs of regression after 3 months, consult your veterinarian.

Should I try apple cider vinegar or home remedies on my dog's warts?

We strongly advise against applying home remedies like apple cider vinegar, tea tree oil, or castor oil to your dog's warts without veterinary guidance. These substances can cause skin irritation, chemical burns, or toxicity if your dog licks them. Some home remedies may also delay proper diagnosis of a potentially serious growth. Always consult your veterinarian before attempting any treatment.

My dog had warts before—can they get them again?

Yes. Dogs develop immunity to the specific papillomavirus strain that caused their warts, but there are multiple strains of canine papillomavirus. A dog that recovered from CPV-1 oral papillomas can still develop cutaneous warts from a different strain. Dogs with chronically weakened immune systems may experience recurrent outbreaks.

How long should I keep my dog away from other dogs?

Your dog is considered contagious as long as active warts are present. Keep them away from group settings (dog parks, daycare, grooming salons, boarding facilities) until all warts have fully resolved. This typically means 1 to 3 months for most cases. Your veterinarian can advise you on when it's safe to resume normal social activities.

Can warts turn into cancer?

Malignant transformation of canine viral papillomas into squamous cell carcinoma has been documented but is considered rare. The risk is higher in older dogs with long-standing, persistent warts. Any wart that changes rapidly in size, shape, color, or texture should be biopsied to rule out malignancy.