Petco Text Logo
Petco Pet Logo

My dog has a black bumpy lump in his mouth. Is it a tumor or cancer?

Updated On September 23rd, 2025

Pet's info: Dog | Standard Schnauzer | Male | 9 years and 3 months old | 34 lbs

Discovered a large mass on the right side of my schnauzer’s mouth. About the size of a walnut black bumpy. It’s solid doesn’t seem painful as I can palpate above it and around its border. But it is sticking out the side of hi mouth. Due to his mustache I didn’t see it earlier.

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on October 22nd, 2017

Thanks for using Petco Pet Education Center, formerly Petcoach! The most common oral tumors in dogs are Melanomas, squamous cell carcinomas and fibrosarcomas. Given the black color of it, this is possibly a melanoma. Your veterinarian could perform a fine needle aspirate (FNA) or a biopsy to diagnose it. Melanoma is the most common oral tumor in dogs. Surgery is usually the treatment of choice as long as there is no evidence of metastasis. If that is not an option, radiation therapy works very well for these tumors. If you prefer to proceed with palliative care, you could consider a course of antibiotics and a NSAID (anti-inflammatory drug), as most of these lesions are both infected and quite inflamed. Your veterinarian could prescribe these. Good luck and have a good day!

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored