Mine said the same thing because they need 3 doses, but if the first one is given too young, it's not always as effective. We didn't know how old my puppy really was (he suspects that she was younger than they said), but her teeth seemed fine at the last appointment so she didn't get a 4th round.
I'd follow the vet's advice. I believe that they do need another round at 16 weeks either way.
I'd follow the vet's advice. I believe that they do need another round at 16 weeks either way.