In order to go out to retrieve, your yorky has to learn to take an article off the ground without you handing it to him.
Sit your yorky in front of you and hold the article to be retrieved close to the ground just ahead of him. Make sure it is something he can pick up easily and not have to struggle to get his mouth around.
If the yorky shows no interest, jerk the leash until he does. Once he takes it from your hand when held close to the ground, actually place the article on the ground just ahead of him and tell him “take it”.
If you insist he comply, soon he should pick up any article you drop on the ground. If your yorky is stubborn about picking up, a series of snaps on the leash will sometimes work where one snap failed.
You could even drag the article in question along ahead of your yorky and give a number of short jerks on the leash while pointing to the article and telling him “take it”.
Your yorky thus learns that you pointing to an article and telling him “take it” means for him to pick it up, hold, and carry it until you tell him to drop it.
When your yorky is good, praise him and make him think he is doing something wonderful. Your dog needs this kind of reinforcement to understand that “take it” means taking whatever from wherever you ask him.
During this latter part of training, use an assortment of articles, not just one or two. Otherwise your yorky will learn to hold just those few articles and will be restricted. Have him hold articles made of different materials such as wood, leather, and paper.
But do so only after you are positive he’s so well-trained that he would never chew anything. This familiarity with various objects and textures will prepare your yorky for more advanced retrieving work, such as seeking out lost articles and scent discrimination.
Use the word, “take it” whenever you give anything to your yorky, even a cookie. This will ensure he understands the command.
Once your yorky is taking articles from the ground on command, it’s time to get him interested in running after the same articles.

