I kinda had this happen with Ace. He got his first 1 yr shot at around 6 months. went in 1 yr later for a 3 yr shot right before I moved. I moved and turned in our paper work to the military vet clinic and thought i was good for 3 yrs...only to get a phone call that he was due for his rabies yet again 1 yr later. The vet in Nebraska had marked it as a 1 yr and there was nothing they could do about it there and he had to have the new rabies to be able to remain living on post.