Over vaccination is just as bad, I won't redo yearly boosters until I run a titer. The only vaccine I have to give to my dog by law is the rabbies. My little chihuahua will not get any of that, he is an indoor dog, and those shots really hurt the little ones. Maybe ill run a titer on him to see how his inmune system is doing but shots and little dogs do not mix well. One my cats was crying for 3 days when she got her rabies and she was completely miserable.