Hi, welcome to Yorkietalk! Because yorkies have been so popular, a lot of people thought they could breed for profit, and many yorkies today are born with serious and expensive health problems. When breeder uses the term "teacup" it's a red flag that means he does not abide by the rules given by the Yorkshire Terrier Club of America, which prohibits use of this word. It the breeder ignores this rule; it's a good indication he ignores other "rules" such as health screening. Some breeders don't care if your puppy suffers serious problems, which may not show up until after you've grown very attached to your puppy. The standard weight for Yorkies is 7 lbs and below, so all standard yorkies are small. We are talking about full-grown dogs, not puppies. Some breeders sell the puppies before the age of 12 weeks so that people will think that they are getting a smaller than usual dog. The YTCA prohibits breeders from sellers from releasing puppies before the age of 12 week. Many people suggest that as you go below 4 pounds as a full-grown weight, health problems increase, and the tiny's are more prone to injuries from accidents such as jumping off a couch. You'll find that all yorkies are fearless, and they don't realize that they are a small dog.