Puppy had first set at the owner's vet. We planned to switch to our usual vet. But they use different brands. Can he go back to original vet for vaccination booster in a couple of weeks then go to our vet? When will he need another booster? If our vet doesn't use the same would they do ongoing/ future ones? I'm not explaining well but are the first two a "set" then we can move vet or is there another ?