Cedar (4.5) had a small marble sized lump on the back of his neck between 1 - 2 years of age (I can't remember exactly when it arrived). We did a needle aspirate and found it was just a cyst. The recommendation at the time was to just watch it and see how it went since it wasn't anything to worry about. A few months ago I noticed it had seemed to flatten out so I took him back to the vet (different vet since I am in a different city). She agreed that it was a cyst and said just to keep an eye on it. The cyst is just under his skin and you can pick it up and move it freely of anything underneath. It is probably the size of a nickel across now. I am taking him back to the vet on Tuesday to discuss removing it since it appears to be getting larger. Am I just being paranoid that it could have turned into something cancerous recently? Literally it has been on his neck at least 2 1/2 - 3 years without any change until recently. . . Thanks for any thoughts.