No, dog warts are not contagious to humans. Canine papillomavirus can be spread to other dogs, though, so if you’ve spotted a wart on your dog, be mindful of this. Talk to your vet before you bring your dog to socialize with others, or before you book a kennel stay for your pup. A general rule of thumb to follow is that as long as the wart is visible, it’s contagious.