I agree with Gary, there are many side effects in dogs being vaccinated more often. I just did vaccination for rabies and no other thing especially vaccines that can boost dogs immune system. But we human and animals have our own immune system and therefore we must boost our immune system by eating the right kind of foods that our body needs same as our buddies.
I am aware of those that are completely against vaccines. I've never heard of this doctor's research saying it is unnecessary to do yearly vaccines. Even though I haven't read the research it does make me think. Who profits from unnecessary vaccinations? We as humans get our vaccinations once. We do we do it annually for dogs? Looks like they only want a profit. I give my dogs their shots with the exception of rabies. I would give that too if the law allowed me to where I live.