Hello everyone! This evening I discovered a lump on Odie's back, right around where he got his vaccines (Rabies, last Parvo, Lyme disease) at the vet on Friday (12/11/09). I'm not sure if this is a normal reaction or something I should be more concerned about. It doesn't seem to hurt him when I touch it, I am able to move it around. I can see it if he is sitting and I am looking for it. He is acting completely normal. He is 3.5months old and weighs 35lbs. Any suggestions???