Welcome to YorkieTalk. It sounds like collapsing trachea or reverse sneezing. When he goes into an episode you could try putting her hand over his nose for a second or two. If that doesn't stop it I would assume it is not reverse sneezing and he needs to see a vet.
There are plenty of foods Yorkies can have. I would AVOID giving chocolate, grapes, raisins, macadamia nuts, onions, garlic (in large amounts), mushroom, salty foods, meat with lots of fat...
Some healthy snacks are boiled chicken, egg, banana, peeled apple, watermelon, green beans and potato (peeled and cooked) to name a few.
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