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Dog on chemo for mast cell tumor: Is this a tick or a tumor flare-up?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Female | spayed | 70 lbs

I have a pitbull mix 8 yrs old who is going through chemo for mast cell tumor. I thought I was pulling out a tick but doesn't seem to look like one after the fact. What do you think? 1st picture is what it looks like. 2nd is what it looked like after I pulled one off.

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Answered By Jenny, DVM

Veterinarian

Published on July 19th, 2017

Ticks can leave a bad rash and create a lot of inflammation at the attachment site. Without seeing what you pulled off, it is hard to tell if it was a tick or not. I would be concerned about it being related to the mast cell tumors due to the intense reaction that was created after the removal. Mast cells can typically get very red and swollen one day after being pushed on then turn calm the next day. It is best to save the piece you removed if possible and have yirbvet check that area to be sure

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