LOL Rylie does this. He will shake a toy so hard that it'll hit the sides of his face sometimes. My parents say that if he ever got ahold of a real animal, he'd kill it easily. I've never seen Lacy shake her toys that hard but Rylie is a vicious little killer

I think it's very normal as they were bred to hunt small prey
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~Magnifique Yorkies~
Purchasing from backyard breeders, pet shops, and puppymills perpetuates the suffering of other dogs.
Educate yourself and buy from reputable breeders or rescue.