Ask a Dog Vet and Get Answers to Your Dog Health Questions
Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
The location of this mass makes surgery a bit challenging. If it's far enough away from the prepuce (foreskin), then it could just be removed and the skin closed after. If it's on the prepuce, then these almost always end up needing a pretty big surgery where the prepuce and penis are amputated and a new urethral opening is made back by the scrotum (scrotal urethrostomy). This surgery is a big procedure, but it's usually well tolerated and they can do well after.
The heart murmur doesn't worry me too much as long as the lungs are clear. A good anesthetist will watch the heart rate and blood pressure closely and use meds that are easy on the heart. They would also go easy on IV fluids during the surgery so they don't stress the heart too much. It's definitely doable though and worth pursuing. You may want to look into a boarded veterinary surgeon for something in this location.
I hope this helps, let me know if you have any other questions.