Murray had his yearly check up 3 weeks ago and at that time got his rabies vaccination, along with a vaccination for distemper. Yesterday I noticed swelling at the site of the distemper vaccination. This morning I took him to the vet, and was told that there is a 'pocket of fluid' under his skin, and that this is a rare reaction to the distemper shot. He is on a 10 day course of Clavimox in case an infection is involved, and I have been told to monitor it and report to the vet if it increases in size. The vet said that he had seen this reaction only once before- has anyone out there had this experience? I have read the vaccination links from the previous thread, but none of them seem to describe anything like this- any input would be appreciated.