Personally I’d be angry, but not because she received more money, but because I wouldn’t know if the home was suitable. Joey's breeder has it in her contract that I'm not allowed to rehome or sell without her permission. If you recall a few years back, something similar happened to Ellen DeGeneres, who adopted a dog from a rescue organization. She had the same stipulation in her contract, and when she found out she couldn't handle the dog, she gave it to someone else. The agency stepped in and took the dog back. Here's more information:
DeGeneres Doggie Drama Continues - ABC News So it sounds like its legal for you to do this. Not sure you can do anything now, if you didn’t have a contract. I would contact the new family and ask them if they had questions about Yorkie care and training. I would tell them to feel free to call me if they ever needed to rehome or for any other reason.