Hi Welcome to YorkieTalk! I had the same problem with Daisy. Only difference is she LOVES treats and that is how I got her trained. We took her to obedience training at 1 yr old and she did outstanding. We still work with training every day while we are walking at the park.
Maybe you should look for another treat that she likes better. Some people give Cheerios for a treat and our trainer recommended little pieces of hot dog for dogs that won't eat treats. We used dried liver treats in training class. Daisy loves green beans and fruit and will do anything for a green bean or fruit. She knows sit, stay, come, leave it, drop it, wait, stay close, stop, go to bed, find the car, and lots more. She is a dream dog now.
Once Daisy was trained she was (and still is) the perfect dog. She used to run out the door and escape to the neighborhood to run and run. Now she will walk out to the car by my side and hop in. Maybe your pup will respond better to a toy. Hang in there and keep working with him and I'm sure he will end up being the perfect dog just like Daisy. He sounds like he is very intelligent already!
Oh and if he gets larger than you expected, there will be more Yorkie to love. Daisy was supposed to be 7 lbs and she is now 15 lbs at age 6. And she is not only the perfect dog, she is the perfect size and we love her just the way she is.
Please don't ever spank him for not obeying, you will never get a Yorkie to respond to spankings. Just so you know.
