I know there are some threads that already cover tumors but she just seems too young to have a tumor. She will be five months on the 12th and she just got her last set of puppy shots on 02/21/09 We only noticed it last night while we were giving our furkids a bath. I called our vet this mornin and he can get us in on the 19th to check it out. But I need hope now I cant wait 2 weeks worring. So please if you have any ideas what it could be.