My dog's fatty lump came back, now it's bigger and harder. What to do?

Question

My mini schnauzer had a lump on her back on the left next to her tail it was removed and there was no cause for concern, it has come back and the vet said it was a fatty lump, it is getting much bigger and harder and I'm worried! Pet's info: Dog | Miniature Schnauzer | Female | spayed | 5 years and 10 months old

Amy S. Eutsey, DVM · Accepted Answer

I am wondering if a full surgical excision biopsy was done on the lump when it was removed. True lipomas or fatty lumps do not typically grow back. She may develop a new one near the area. There are other types of masses that look very similar to a lipoma but are malignant. A Mast Cell Tumor can look exactly like a fatty tumor but a biopsy report from a pathologist would have been able to distinguish between the two. A Mast Cell tumor can become hard and inflamed. When these masses grow around the rear/tail/anal area or the "perineal " area, they can be quite aggressive and difficult to completely surgically excise. Belle should definitely have the mass addressed as soon as possible and it may be helpful to see a biopsy report from the first surgery.

My dog's fatty lump came back, now it's bigger and harder. What to do?

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