I lost one of my yorkies in Jan to a big dog, he came in my yard, bit my dog and my Harleyman died. He and Isabel, my other yorkie, had been together from 6 weeks on so I wanted to find a companion for her. (they were 6yrs old). The vet recommended a male puppy so she could teach him her ways. She was always the dominate dog.
Well, in March I found an ad for a 10-month old male yorkie for $500. When I called, she said she had been training him for the show ring, but she felt he just didn't have the
personality so she was putting him up for sale. She had had him neutered, micro chipped and all his shots plus rabies, so I thought that was a good deal. He is a great little dog, but is this usual? She said he won best puppy at a dog show, so how usual is it that she would decide he just wasn't cut out for it?
Yes, this does happen. Mary, do you want to explain this further?
To continue the saga, I got him on a Friday night, he jumped off the bed and kind of whimpered; I figured he just got neutered, it must have hurt. He jumped off again Saturday night and whimpered a little louder and longer. Sunday morning he LEAPED off the bed, broke his leg, it wouldn't set so it was amputated in June.
He's 10 months old and you continued to let him leap off of your bed? 
So I have always wondered, did she know somehow that his leg was injured and is that why she sold him? Vet says no way of knowing.
Wouldn't trade him for the world, but this has been bugging me.
Thanks.