The dog lived here when it was first born. I think it did have vaccinations, because it lived here in chicago and then my partners uncle flew it out to puerto rico and it's lived there since... This was years ago though.
I would like to correct you on dogs and puerto rico, though. It might be law, but nobody listens to it. There is a huge and I mean HUGE stray dog problem in puerto rico. It's so bad you can walk down the street and have ten + dogs following you in some areas. All of the dogs are allowed to roam freely and they breed like crazy. Their offspring is then homeless and nobody gives enough crap to vaccinate or sterilize their animals. Just google it. There are Dead/dying dogs just laying out in the street and nobody cares to even clean up the bodies. I am not over exaggerating. Do a quick google search. It is awful awful awful. That's why I was worried about rabies.