What is the difference between the 3 year and the 1 year rabies vaccine for cats?
There is about a 1 in 10,000 chance that a cat might develop a tumor at the site of the rabies injection with the 3 year vaccine. It is thought that the cause of this may be because of the “vehicle” that the vaccine is carried in. The 1 year vaccine does not use this particular kind of vehicle, so there may be a reduced chance of the tumor developing when this vaccine is used. We still are not sure at this time what the true cause of these rare tumors is.
