Canine papillomavirus most commonly occurs in puppies. These dog warts may look unsightly and uncomfortable, but most pose no serious health risks to your dog. However, it is important to seek veterinary care if you notice any growths or lesions on the pet's skin because some types of dog warts could indicate more serious health conditions. Unfortunately, though the warts are benign, a dog presenting with an outbreak of multiple warts should not attend daycare, and should not interact with other dogs until the warts have fully cleared as a massive outbreak could impede a dog's ability to eat or drink.