I have a 10 year old Shih Tzu named Prince. A while ago my mother found a small lump under the skin on his neck (about the size of a 5p coin) I looked at it and it doesn't seem to cause him any discomfort. I was able to move it so it wasn't attached to anything. I looked up what he might have (bad idea) and started to panic as people were saying it could be a tumor. I told my mother to take him to the vet but she's afraid they'll tell her it's bad and I don't know what to do im only 14. I checked it again recently I think its grown a bit but im not sure, I could be paranoid. Does anyone have any ideas what it could be?