11 Year Old Springer Spaniel Has Large Growing "cyst-like" Bump On Leg,What's The Matter?

It seems to be on the inside (not a nodule). Any ideas?


Answer:
My first dog had a similar lump on her hind leg the size of an egg.  We have a needle biopsy done and they said it was benign not to worry.  It continued to grow to the size of a baseball.  We have it removed because even though it did not bother her, it did not look nice.  She never had a problem after that with her leg.  I suggest taking your dog to a Vet just to be sure it is not cancerous.

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