Q. My dog has a mast cell tumor on top of her ear. It has grown very fast in (2) weeks. Can waiting 2 more weeks to remove it harm her ?

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A. If you're sure it's a MCT, I would get it off as quickly as possible. It may be a low grade, which means it's unlikely to metastasize, however you can't know that without a biopsy, and you'll need to get it off in order to get that done. Many MCT's don't metastasize and removal (with 1.5 - 2 cm surgical margins) is completely curative. But if it's a high grade you're taking a risk by leaving it there any longer. I'd get it removed as soon as possible.

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