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12-year-old cat is hiding and has oozing tummy tumors. Is it cancer?

Updated On September 23rd, 2025

Pet's info: Cat | Selkirk Rex | Female | spayed | 11 years and 9 months old | 4 lbs

My 12 year old cat has been acting strange over the past few weeks and has started hiding in the litter box most of the time. Initially we thought it might be due to the other cats picking on her so we put out a new litter box and food for just her but the behavior hasn't changed. Today when I picked her up I noticed three tumors on her tummy that are really big, one of them is kind of oozing and looks infected. Is it breast cancer?

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on November 27th, 2016

Poor Squash! It is possible that she does have mammary tumors, or it could be another type of cancer causing these tumors. Unfortunately, cancer is always a possibility in an older cat. If one of the lumps is oozing and looks infected, then Squash needs to see a vet right away. I would take her into an ER vet or a find a vet on call in your area to have her examined. If it is mammary tumors, they are very aggressive, and 85% of mammary tumors in cats are malignant. If for some reason you can't find a vet on call, I would take her into the vet first thing in the morning.

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