FYI...I've heard every 6 months to 1 year. If your dogs are around a lot of other dogs (i.e. dog parks, walks, doggy day camp, etc.) it is good to do it every 6 months. I take Stomper to PetsMart Doggy Day Camp and they require it every 6 months to protect all of the dogs.
I think they can put it up the nose or inject it.
__________________  Kimberly & Stomper |