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My dog has a growth. How are pet tumors diagnosed and treated safely?

Updated On September 23rd, 2025

Pet's info: Dog | American Staffordshire Terrier | Female | spayed | 9 years old | 43 lbs

My vet said it's hard to get cells for fine needle aspiration because of the lesion's location. Is that true? The growth suddenly enlarged due to a bacterial infection- I've attached a pic of it from 2 years ago. Is it difficult to get clean margins for this growth if I opt for surgery? What kind of growth could it be? Sebaceous cyst? Mast cell tumor? Lastly, what in the blood-work indicates that Val is safe for sedation?

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1 Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on May 1st, 2019

Very small masses can be tricky to get enough of the needle in the mass without going through it. This area of the body can be tricky to get enough margins due to the lack of tissue before you hit bone, and the movement in the joints makes closure difficult. It could be any number of soft tissue masses, including a wart, mast cell tumor, squamous cell carcinoma, etc. If your vet cannot get enough cells for diagnosis with a fine needle aspirate, simply taking a surgical biopsy without removing the entire mass is an option. When we do bloodwork prior to anesthesia, we are checking the liver and kidney values are normal, no anemia or signs of infection, adequate protein levels, etc. we just want to be aware of any issues inside the body to be able to adjust anesthetic protocols.

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