Hi, my older dog developed a mast cell tumor 4 weeks after a rabies vaccination, not at the site of the injection but on the same side of the body (in the back leg). It grew rapidly and this week we had to euthanize her. I am just trying to find out what could have happened, I'm not going to sue anybody. Could it have been caused that fast from the vaccine? Are there different types of rabies vaccines, ones that might be safer? Any information with this would be greatly appreciated. Thanks in advance Karen S.View Thread