Hi there.... You should start by doing a lot of research on the breed. And YT is a great place to do it
Yorkies can be a bit spoiled and hard to train, but ya gotta love em
Also, I have a 6 year old, who was 5 at the time we got Meka...and she does good with her. Though, I probably would have prepared her a lot more prior to puppies arrival, but you learn as you go. The best thing to do is look for breeders in your area... and be sure to do your homework on that breeder
