About Hypoglycemia:

This condition is normally triggered by stress and occurs in exceptionally small toy puppies between six and twelve weeks of age. Hypoglycemia can occur without warning when a puppy is placed in a new home, becomes exhausted from too much playing, or has digestive upset. Hypoglycemia is a condition in which the blood sugar level drops rapidly. Without immediate attention, the puppy could go into shock and die. 

If your puppy is contentedly playing, receiving enough rest/sleep, eating and drinking, and if they're alert, there is no reason for any great concern. If you are in doubt, check with your veterinarian. 

Because of the move to a new home is already stressful for the puppy, you should not change the puppy's diet. Any new food change should be added to the diet gradually at a later time. We recommend 1 teaspoon of white Karo Syrup in 1 cup of water for your puppy's water the first week in your new home. 
With our smaller puppies, we supply canned A/D and a forti-cal supplement in our puppy kit. Forti-cal is a high calorie sugar supplement that we recommend giving twice a day. If the puppy is too overwhelmed or excited and stops eating, we recommend mixing in some canned food, sprinkling parmesan cheese on the hard puppy kibble, or mixing in 2% cottage cheese. The additional add ins may help stimulate an appetite in the puppy.
 "Small breed puppies, especially Toy breeds, require careful feeding to prevent a condition called hypoglycemia. Hypoglycemia is the scientific word for low blood sugar, and small breed puppies are prone to developing this condition as a result of high metabolic rates and low sugar and body fat reserves. This means they need to be fed a calorie-dense, small breed puppy food anywhere from four-to-six times a day and watched closely for symptoms of hypoglycemia.
Symptoms of hypoglycemia in dogs:
  • Weakness
  • Lethargy
  • Muscle tremors
  • Seizures
Most complete and balanced small breed puppy foods contain the appropriate amount of nutrients for small breed dogs. They also have smaller kibbles, which are easier for small breed puppies to chew and are less of a choking hazard. Talk to your vet about the risks of hypoglycemia and what you can do to prevent it in your small breed puppy. If you suspect your puppy has hypoglycemia, call your veterinarian immediately."

Steps to Prevent Hypoglycemia:

"1) Feed small dogs often. Toy breeds and puppies require more glucose than larger dogs, so they are more susceptible to hypoglycemia. To avoid this, feed your small dog often. Feed your dog a meal high in quality protein, high in fat, with complex carbs, like white rice.
  • Make sure to keep small dogs warm if they are underweight or don’t eat
2) Limit stress for puppies. Puppies under three months old can get hypoglycemia because they haven’t developed enough to regulate their blood sugar. Because of this, stress can bring on hypoglycemia. Limit stressors, such as poor nutrition, cold environments, and intestinal parasites.
3) Feed your dog more before high levels of activity. If your dog is going to be engaging in high levels of activity, such as hunting, then you need to feed him beforehand. Give him food a few hours before the activity. The food should be high in protein and fat.
  • Intense exercise when a dog hasn’t eaten can cause hypoglycemia.
  • Don't strenuously exercise a dog who has just eaten a meal, as this can cause bloating. Wait at least 90 minutes after feeding before exercising your dog."
Sources: 
Burke, Anna. “The Best Dog Foods Specially Formulated for Small Breeds.” American Kennel Club, 2 June 2016, www.akc.org/expert-advice/nutrition/general-nutrition/food-for-small-breeds/.
Elliott, Pippa. “How to Prevent Hypoglycemia in Dogs.” WikiHow, WikiHow, 30 Sept. 2017, www.wikihow.com/Prevent-Hypoglycemia-in-Dogs.