SIZE...Is one of the things I hear all the time.. Everyone wants a 3# or less size yorkie.... WHY??? you have to be so careful with them.. I have Bumbie that is less than 3# could not go out with the bigger dogs till he was 8 months old as he was so small.. You have to watch people around that size of a dog.. I've had 2 of my tinny's I've sold to people be killed by being slammed in a door.. They get stepped on broken legs and just not meant to be for every house hold... A 7 pound yorkie is not a big dog.. I have cats bigger than that..
Health would be my main concern with the pup you bought.. I know puppymill people that feed their pups nothing but macaroni to keep them tinny till they get to new home.. Lovely puppy mill people..
NEVER BUY A DOG FROM A BREEDER WHO HAS MORE THAN ONE BREED OF DOGS... SEE ADULTS OR DON'T BUY.. ALL PUPS ARE CUTE YOUR NOT SAVING ANY PUP FROM A BAD BREEDER YOUR JUST ENCURAGING THEM TO BREED MORE WITH YOUR BUYING OF IT... ON GOING CYCLE OF PUPPYS FOR MONEY NO THOUGHT AS TO IMPROVING ON ANYTHING ONLY THE PRODUCTION OF LITTLE DOLLAR SIGNS AS THIS IS WHAT THEY ARE TO THIS TYPE OF BREEDER..
Sorry for the yelling but your the one that will have to live out your life with this new little guy.. If you don't find another home for him...? If he develope health issues on top of what you just said.. You can count yourself lucky.. Hope you decide to keep him as poor little guy may if not a healthy dog end up in rescue. Then that's another sad story.....like this one...