Other than your Yorkie being hurt because of something dropped on her or because she jumps from too high a place. I don’t know about problems with this if you truly like very small dogs. I have an advantage here because my Yorkie loves to run and take long walks, so I guess that’s one reason he’s so strong.
And he’s not on the itsy bitsy side, like some adult Yorkies I’ve seen that are four pounds tops. You have to really protect a dog that is small and fragile. If you’re in the kitchen just opening a can of soup, it probably weighs about a pound, and if your dog is three pounds, remember that’s a third of her size. It’s like if you weigh 150 pounds, having a 50 pound object slam down on your head or back!!!