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He is a young dog so his chances of a cancerous lump are low, possible but low. It would be a good idea to have this lump tested by a vet to make sure this is nothing we have to worry about. Your vet can get a sample using a needle. Also, if the lump is continuing to grow the lump might need to be removed before it gets any bigger. If the lump is soft and moveable it could be a fatty tumor which is benign, a cyst, or even an abscess. If the mass is firm it could be something more serious. The sooner he is seen the better. Good luck Dr. Jenn