I wish you well with your new puppy if your mind is made up but I would just like to add one more thing that I don't think was mentioned.
The vet check up is important but can only check out the very obvious. Most inherited diseases do not show up until 2 yrs old or later.
I don't think people are trying to do anything but help you but you are going through that poor little yorkie in the window feeling and I understand but you only keep people in business by buying from them. I left a Japanese Chin breeder a while back and loved the dog but just could not do it once I realized what he was running and what I was setting myself up for later on in it's life. I don't know if I would have had that strength at your young age to walk away but then again, I would not have had all this wonderful advise. Hugs, Joan |