[gemy]

I am not sure I read a part of your post correctly, are you keeping a Yorkie as an outside dog, or just letting him out with your other dog?

Behaviour of a dog in a shelter is quite altered. THey are being kept in a hugely stressfull environment with thousands of smells, other dogs barks/whines and pain being broadcasted at them 24/7. Dogs can shut down in this environment or conversely become more unruly. So a "quiet" dog in a shelter is no indication that he will be a quiet dog in your home.

When you take him out for a walk, is he crying, whining or barking, like he is in the house?

Do you have a warm bed for him, in a place that he can feel secure in resting in?

Does he like treats? If so use the command BARK and reward him for his Barking. Then introduce the command NO BARK. Don t reward him for barking outside of your command of bark! You can try this, but it might take a least one month to get that barking under control.

ON the subject of outside dogs, Yorkies of today are not designed to be 24/7 outdoor dogs, they do need their family companionship, not to mention the warmth of the house.