My dog's tumor was benign, but now it's malignant. What happened?

Question

Woke up one morning and found a huge tumor on my Service Dog. It was located just above his leg and under it. It was not attached but it was solid. I immediately took him to our Vet. He evaluated him and the tumor, and observed the same info I did. Within 10 minutes he was in surgery. After an hour, I received a call telling me that on examination there were no malignancies present. He had never seen one before. Biopsy came back clean. He was fine other than stitches. 1 month later, a malig tumo. Pet's info: Dog | Poodle | Male | neutered | 8 years and 1 month old | 90 lbs

Andrea M. Brodie, DVM · Accepted Answer

I am afraid your question was cut off. This is indeed quite a big tumor. Some tumors can be so-called mixed tumors, so when a biopsy is taken it is possible that in such a mixed tumor the biopsy is only made up of benign material. Unfortunately this could mean that there still is a component of malignancy in such a mixed tumor and this could have happened, if now the tumor appears malignant. Since your question got cut off, I suggest you ask your question again so we can be of service and help you with your query.

My dog's tumor was benign, but now it's malignant. What happened?

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