Most warts on dogs are caused by the canine papillomavirus and will disappear on their own within three to six months as the dog’s immune system fights off the infection. Some warts persist longer, though, and others cause pain, bleeding, or difficulty eating. When that happens, several veterinary treatments can speed things along, and there are steps you can take at home to keep your dog comfortable in the meantime.
Why Dogs Get Warts
Canine warts (papillomas) are caused by a species-specific papillomavirus that spreads through direct contact with an infected dog or through shared toys, bedding, and food bowls. The virus can survive at least two months on surfaces kept around 40°F, but only about six hours at body temperature (98°F). Young dogs and dogs with weakened immune systems are most susceptible because they haven’t yet built immunity to the virus.
Once the immune system mounts a strong enough response, the warts shrink and fall off. Most resolve within three to six months, but in some cases warts can stick around for up to two years before disappearing on their own.
Identifying Warts vs. Other Growths
Viral warts typically show up as small, rough, cauliflower-textured bumps. They’re most common on the feet, face, and ears. Oral papillomas appear as clusters of smooth or bumpy growths on the lips and inside the mouth. Some dogs also develop pigmented plaques, which are flat, dark patches usually found on the inner legs.
Older dogs frequently develop sebaceous gland tumors, which can look almost identical to warts. The key differences: viral warts tend to appear on younger dogs and cluster around the face, while sebaceous growths show up in any location, often in multiples, and almost exclusively in older animals. Because the two look so similar to the naked eye, a vet may need to examine a tissue sample to tell them apart. This matters because sebaceous tumors and warts require different management.
When Warts Need To Be Removed
Not every wart requires treatment. A single small wart on your dog’s leg that isn’t bothering anyone can safely be left alone. Removal becomes necessary when warts bleed, become ulcerated, get infected, interfere with eating or walking, or simply refuse to go away after several months. Oral warts that grow large enough can make it painful for a dog to chew or swallow, and warts on the paw pads can cause limping.
Watch for signs of secondary infection: redness, swelling, discharge, or a foul smell around the wart. Dogs that constantly lick, scratch, or bite at their warts are more likely to break the skin and introduce bacteria. If you notice any of these signs, your dog likely needs veterinary attention and possibly antibiotics.
Veterinary Removal Options
Your vet has several tools for removing stubborn warts, and the best choice depends on the wart’s size, location, and how many there are.
Surgical excision is the most straightforward approach. The vet cuts the wart away under local or general anesthesia. This works well for isolated warts or those in locations where they’re causing functional problems, like the eyelid or inside the mouth.
Cryotherapy uses liquid nitrogen to freeze the wart tissue. The vet applies multiple freeze-thaw cycles (typically five or six) to destroy the growth. In a study of dogs with persistent papillomas, cryotherapy resolved all treated lesions. Two of the three dogs needed only a single session, while the third required a second round. This method is particularly useful for smaller warts and avoids the need for stitches.
Electrosurgery and laser therapy are additional options that use heat or focused light to destroy wart tissue. These tend to be available at specialty clinics rather than general practices.
Medications That Help
When warts are too numerous or widespread for surgical removal, medications can help the body clear the virus faster.
An oral antibiotic called azithromycin has shown strong results against canine papillomatosis. In a controlled clinical trial, dogs treated with a 10-day course had complete resolution of their warts with no recurrence over eight months of follow-up. Dogs in the placebo group didn’t fare as well. This is one of the more commonly prescribed medical treatments, and it’s generally well tolerated.
Cimetidine, a medication originally designed for stomach acid, has immune-boosting properties that can help fight viral warts. It works by activating certain immune cells that target virus-infected tissue. In a study of 55 patients with multiple viral warts, about 35% achieved complete remission and another 24% had partial improvement within four months. Higher doses were more effective than lower ones. While most of the published research is in humans, vets do use cimetidine off-label for dogs with persistent warts.
Autogenous Vaccines
For severe or recurring cases, your vet can create a custom vaccine from your dog’s own wart tissue. The process involves taking a biopsy sample from one of the warts, grinding it up, suspending it in saline, and treating it with chemicals to inactivate the virus. The resulting vaccine is injected under the skin, typically once a week for four weeks.
This approach essentially trains your dog’s immune system to recognize and attack the papillomavirus more aggressively. In documented cases, complete regression of warts occurred within two to four weeks of starting the vaccine series, with no adverse effects. Autogenous vaccines aren’t widely available at every clinic, but they’re worth asking about if your dog has warts that keep coming back or won’t respond to other treatments.
Home Care While Warts Resolve
Whether you’re waiting for warts to clear on their own or supporting veterinary treatment, there are practical things you can do at home. The most important is preventing your dog from traumatizing the warts. An e-collar can stop licking and biting, which reduces the risk of bleeding and infection. Keep the area around warts clean and dry.
Some pet owners use topical Thuja occidentalis, a homeopathic preparation derived from cedar. It’s been used in veterinary practice as a topical application for warts, and a study in Veterinary World reported no adverse effects from its use. However, the evidence for its effectiveness is limited and mostly anecdotal. If you want to try it, use a product specifically formulated for animals and apply it only to the surface of the wart, not to broken skin.
Avoid trying to cut, tie off, or burn warts at home. These methods risk serious infection, excessive bleeding, and scarring. They can also spread the virus to other areas of your dog’s skin.
Preventing Spread to Other Dogs
While your dog has active warts, the virus can spread to other dogs through direct contact or contaminated objects. Wash shared toys, bowls, and bedding regularly. If you have multiple dogs and one develops warts, keep an eye on the others, though many adult dogs with healthy immune systems will resist infection even with exposure.
Avoid dog parks, daycare, and grooming facilities until the warts have fully resolved. Once the lesions are gone, your dog is no longer considered contagious. Dogs that have cleared a papillomavirus infection typically develop lasting immunity to that particular strain, making reinfection uncommon.