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My dog has a black round growth on his penis. What should I do?

Updated On September 23rd, 2025

Pet's info: Dog | Dachshund miniature | Male | unneutered

I sent you the wrong picture of my dog Pongo, he has a very large black round thing on the shaft of his penis

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1 Answer

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Answered By Andrea M. Brodie, DVM

Veterinarian

Published on April 5th, 2018

This is a black mass that should very definitely be examined by your veterinarian, This could very likely be a melanoma or similar cancerous mass and may need to be removed. Your vet will likely do a fine needle biopsy to either send in to a lab or examine under the microscope to see whether it is cancerous, Please do not wait long to make an appointment with your veterinarian, This could, of course also be a benign growth, however it is not possible to determine whether it is benign or malign by way of a photo.

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