A dog will obey his owners commands but wont obey a stranger.
You are a stranger to him and he a stranger to you at this moment in time.
You need to gain his trust before he will begin to respond to training.
You know nothing about this dogs history, he may well have been abused and could be frightened of people.
Chances are he has never been groomed before so it was probably a bit of a shock to him, you may have lost any trust that he first had in you.
You need to show him that he CAN trust you and then I am sure he will begin to obey you.
It dosnt matter if you have owned dogs for 100 years, every dog and breed has a different personality, and as yorkieusa already mentioned yorkies are famous for being independent.
I recommend you read up on the breed before you begin training.
And nobody here is giving you ugly replies, we are giving you advice.
