I have never heard of that food either but I suppose it depends what country you are in.
It is really hard to make a natural diet for dogs and get all the good stuff in it right. But I have studied and used a natural diet for my dogs. I found the best books are by Dr Ian Billinghurst called - Give your Dog a Bone and The BARF diet.
Basically,, lots of bones ( good for teeth/minerals and vitamins), meat and
RAW vegies and fruit. Yes RAW - cooking kills off all the good stuff!! Meat of all sorts, vegies include mainly greens and most fruits - put all vegies and fruit through a blender/food processor tilll it turns to mush, mix with meat and give bones as well. Basically you are trying to give what a dog would eat in teh wild - the vegie mush is inside of preys belly ( yuck but the first thing a dog would eat), then the meat and bones. When was the last time you saw a wolf light a fire and cook up his prey??? lol

DON"T FEED -chocolate, onions raw, potatoes,pumpkin ( starchs have to be cooked), lots of grapes and avocados bad too.
add extras like garlic(for flea protection), kelp, cottage cheese or yoguhrt, and cod liver oil.
I hope this helps a little and I do recommend following the Ian Billinghurst BARF diet so you get it right.
Good luck and happy food gathering with your shorkie.
p.s I still fed supercoat dry to my dogs once a week in case I missed anything and it easier if travelling/kennelling if on dry food too.