There are many good dog foods on the market, but few are sold in
grocery stores.  Do your homework and find the best high-protein
food that you can afford for your pet. Because of their small size,
Yorkshire terriers do not eat much.  High-quality food is one of the
most beneficial things you can do for your loved one. Although
they adore human food, I recommend this in moderation and not as
an everyday treat. Puppies are quite sensitive to what you feed them
and may experience vomiting or diarrhea with new or excessive food
intake. We recommend Purina 1, Science diet formulas, and of
course, any veterinarian recommended food formulations.
Treats: A word of caution about Chew Treats.
If you do give your pets rawhide treats, replace them often. In some cases,
dogs have gotten them caught in their throats, which means a fast trip to
the emergency veterinary hospital or worse. As a puppy or dog chews them,
they soften, and the dog is able to get small pieces off. As the treats wear
down in size, the possibility of accidental choking increases.  
Please use these treats with caution.
Also note Hypoglycemia below.
Make sure Yorkie Puppies and other small breeds are feed
three times a day, with at least two meals being of the dry
ration. If you're giving your puppy milk bone treats, one
of them is like a meal so you can't expect them to also eat
a full ration of dry at the same time. Keep treats to a
minimal, remember that a tablespoon of something is to
them a good-sized treat. My dogs love vegetables of all
types, carrots, squash, green beans and also many fresh
fruits. Even those are kept at a minimal, a bite or two will
keep them happy. Too many treats will also throw off the
balanced diet they need and should be getting from their
regular diet.

Hypoglycemia: Hypoglycemia or Low Blood Sugar can be
caused by stress, improper diet or a missed meal, being
chilled, or too much energy being used during the day
playing too long at one time. Puppies that usually are
affected are the toy breeds at six weeks to 12 weeks old.
The liver stores energy, but in a small puppy it can not
store enough for long periods, especially with additional
stress factors. Signs of this can be as slight as a depressed
attitude or as serious to finding your puppy in a coma.
Treatment can be as simple as giving a small amount of
Karo Syrup for a mild case to a Dextrose Solution
intravenously by your Veterinarian. If you suspect this
condition, consult your Veterinarian for even a mild case.
Repeated episodes can lead to further more severe
complications.
Food & Treat's