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My dog's mast cell tumor removed. What's the grade and prognosis?

Updated On September 23rd, 2025

Pet's info: Dog | French Bulldog | Female | spayed | 3 years old | 20.3 lbs

Juat got the results of a biopsy of a small lump that appeared on her hind leg, the vet said he removed all the tumor and the margins are clear, no cancer cells in the surrounding area. Im trying to fogure out the grade and stage of the mast celm tumor but the diagnostic only says locally aggresive. And the vet doesnt tell me anything else. Im attaching the biopsy results, maybe you can give me some light on this. Her vet said we have to take care of her not growing back anoher tumor.

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2 Answers

Most Helpful Answer

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Answered By Lauren Kennedy, DVM

Veterinarian

Published on April 21st, 2019

From the report it appears that this is a low grade tumor. This is based on the number of diving cells seen when examining the tissue. That, and the fact that it was completely excised means there is a very low likelihood that the mass will return or metastasize. However, dogs that have mast cell tumors are prone to have additional ones come up in other areas throughout the skin. So it is best to keep a close eye on Lola and have any new masses checked out as soon as they appear. I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.

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    Answered By Destini R. Holloway, DVM

    Veterinarian

    Published on October 29th, 2019

    It appears that your pet had a mast cell tumor grade II with clean margins, meaning that your pets entire mass was removed with little to no chance of recurrence in that same area. However, other mast cell tumors can pop up in other places and so any new lumps or bumps should be checked by your vet promptly. Also the median survival time for pets with this type of tumor is 2 years. If you are looking for more prevention options for your pet, I would highly recommend having your vet refer Kyo to an oncologist. There are even options for vaccinations against tumors like this, but this is typically done at the time of surgery, since tissue cells from the current mass are needed in order to formulate your pets specific vaccine. Vaccines against masses is a ground-breaking way to prevent future masses from developing, so hopefully this is an option for your pet Kyo. I hope that things work out well moving forward. Based on this report it is a relatively good outcome for Kyo. Take care.

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