My mom has a yorkie that weighs 18 pounds. his mom was 6 pounds and dad was 4 1/2. The lady my mom got him from was honest with my mom when she bought him as a puppy. She had been breeding for about 5 years. She told her that she was still trying to establish her bloodlines. She also told my mom that in those five years she had two puppies grow to be quite large. My mom didnt care and got him anyway. He is the cutest thing. He is so smart. He doesnt really seem big. She gets irritated when people ask her if she is sure he is a yorkie. She originally thought wanted a small dog. Thats why she wanted a yorkie....until she saw Rusty of course. When she sees one of the smaller ones now, she is glad of his size that way he is not easily hurt. He is also very healthy and has no health problems at all. Rusty is now about 1 1/2 years old. I have a yorkie also. Millie is 6 months old and weighs 4 pounds.....and they have a blast when they play together.