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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
Can you share pictures of what you're seeing?
It looks like the area is open and bleeding. Has your vet performed any diagnostic care on this area such as an impression smear? Has surgical removal been discussed?
Hi again, Corina. I think surgical removal is going to be your best bet. Even with the known heart murmur your vet should be able to give a light sedation and remove this area. It should not come back so long as they're warts, but it would be wise given his age to have a histopathology done to ensure this is not a cancerous area. Are you seeing active bleeding at this time or is it just moist and pink?
Once he's been sedated, your vet should be able to take those off, as well. Warts are very common in aging dogs, so this is quite par for the course in pet ownership of a senior canine. Some dogs develop them, some don't. Once they become large enough they're certainly worth removing so the pet is not agitated by the presence. You can apply regular Neosporin, as well, daily to keep the area soft and help with discomfort. If scratching is a problem, consider using an e-collar around the neck from your vet's office or pet store to prevent this.