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My dog's mouth growth turned black. Is it serious? What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | unspayed | 6 years and 10 months old

hello, sorry to bother.my dog has a growth in her mouth.. same color as her gums, it’s actually into of one of her side top tooth. this morning I got home from work, looked in her mouth and the growth has now turned black in color. what does it mean? how long do I have to get it removed? can it burst? what do I do?

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1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on April 3rd, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This could be a benign or malignant growth. Judging by the color and the fact that it is in the mouth, it is likely a melanoma, the most common oral tumor in dogs. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have her evaluated by your veterinarian for further assessment and treatment. I am really hoping for something benign. Good luck and have a good one!

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