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Originally Posted by Maximo Siberian Huskies have a very strong prey drive. You husky may be a friendly dog, but instincts are instincts and you never know when they might kick in. Siberian Husky Breed Profile |

Just wanted to add, my brother raises and works his Husky dogs. He has even done the Alaska Race thing and shows many times. He said to me, "Never trust a Husky to be tame. Wild runs in their blood and they can go from dog to wild predator in a heart beat. That is why they survive when other dogs would die."
Maybe your Yorkie knows this instinctively.