Let’s talk about Hypoglycemia for a minute. As puppies (up to around 4 months), if yorkies do not eat regularly or become stressed they risk becoming hypoglycemic. Hypoglycemia is the medical term for low blood sugar, which is a condition in which there is a drastic, sudden drop in the level of blood sugar in the puppy. Some examples of common stresses include: weaning, teething, vaccinations, a change in environment, shipping, over-handling, cold temperatures, intestinal parasites, infections, anorexia, etc. Many yorkie puppies simply play too hard and stress their system or forget to eat.
Hypoglycemia is easily treatable in the early stages, but fatal if allowed to progress. You will always need to be aware of the signs and act quickly. The first symptom of hypoglycemia is the yorkshire terrier puppy slows down and then acts listless. The puppy will then begin to tremble or shiver - a reaction caused as the brain is starved for glucose. More signs of an attack are weakness, confusion, wobbly gait, frothing or drooling from the mouth - sometimes even a seizure. His body will be limp, lifeless, and a check of the gums will show them to be pale, almost a grayish white in color rather than a healthy bright pink. The puppy’s body temperature will be lower than normal. After a time, the puppy will become comatose and may even appear to be dead. At that point, the puppy can go into shock and, if not cared for properly and immediately, may even die.
If yorkie hypoglycemia is caught in the early stages, rub Nutri-Cal (Caro syrup or honey will do if you have no Nutri-Cal) on the puppy's gums, under the tongue, and on the roof of the mouth. Get a heating pad or heating blanket and slowly warm the puppy to proper body temperature. If the puppy responds, all is well. Feed a quality, canned food containing, high-carbohydrates and protein right away (you may want to mix it with egg yolk) and then monitor the puppy to be sure that the condition does not reoccur. Be sure to eliminate the stress that caused the episode if at all possible.
If the hypoglycemia is caught in the more advanced stages, rub Nutri-Cal or Caro in the mouth, and carefully insert a small amount in the rectum. Slowly warm the puppy to normal body temperature (101-102 degrees F) and keep him warm continuously with light heat. If the yorkie puppy still does not respond, carefully eye dropper dextrose solution or Caro water into the mouth, a little at a time but only if the dog can swallow.
Call your veterinarian immediately and inform him that you have a hypoglycemic yorkie puppy.
So now that you know all that, the good news is once they get past the puppy stage and mature, Yorkies are very small eaters so it won't be expensive to feed them. You can expect your full grown yorkie to tip the scales at a normal weight range between 4 – 7 lbs. A teacup yorkie will be 3 lbs full grown.