Hypoglycemia can be a real threat to all tiny puppies, not just Yorkies. Watch for your puppy to become tired or droopy. The first signs are those of listlessness and depression. They are followed by muscular weakness, tremors, and later convulsions, coma and even death. The puppy may appear depressed or may be weak, wobbly and jerky, the head appears to be tilted to either left or to the right and the neck appears to be stiff and in a locked position and the body may soon be the same way. The teeth may be clamped tightly If your puppy has any symptoms of hypoglycemia you must act fast.
Treatment:  If the puppy is awake, give it Nutrical, or Karo syrup by mouth.  You should see signs  of improvement in thirty minutes. You can also pour Karo in warm water and stir to dissolve it and dribble it in its mouth with a syringe. You can also dissolve Karo and Nutrical in water and put drops in the puppys mouth with a syringe. Rub the throat gently to encourage swallowing if necessary. Again you should see improvement within ten to thirty minuets. If no improvement,  then call your veterinarian.  If the puppy is unconscious it should be taken to the veterinarian at once.

Prevent Hypoglycemia from happening by allowing only twenty minutes of play at a time, followed by rest or sleep.  Do not allow the puppy to overtire at first.  Supervise closely with children to make sure puppy is getting enough rest.  Keep puppy warm, don't let it become chilled.  Your Yorkie puppy is a house dog and should not be living outdoors.