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My dog has a mast cell tumor and is vomiting. What's the prognosis?

Updated On September 23rd, 2025

Pet's info: Dog | Pit Bull Terrier | Female | spayed | 6 years and 3 months old | 60 lbs

I have a female pit bull 6 yrs old with grade 3 mast cell tumor. The past few days she has a slightly decreased appetite and occasional vomiting. I am taking her to her vet tomorrow but was wondering what prognosis I may need to prepare myself to expect at this point based on her diagnosis and recent symptoms?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on April 26th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This depends on many factors. It depends on where the main tumor is located, if it has spread to other organs, among many other factors. Even high grade tumors can have a good longterm outcome of years of survival when treated aggressively with surgery and chemotherapy if there is no evidence of metastasis to internal organs. However, if there is already spread to internal organs like the liver and the spleen, the survival times tend to be closer to 3-4 months even with chemotherapy. Staging to check for metastasis usually includes thoracic radiographs, abdominal ultrasound and assessment of the local lymph nodes. At the very least, I recommend medications like Pepcid, Benadryl and prednisone that can help with these cases when there is still evidence of a mass present. Good luck and have a good night!

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