I would not risk little kids around my yorkies. Why set the dog up for injury if it can be avoided? The child and/or the yorkie could get injured. That being said is I ever had kids they would be taught from birth to be nice to the yorkies
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Mine are great with kids but 100% supervised when with kids. If I can't watch the yorkies go away to an x-pen, different room with lock up high on door, etc.