If you have decided to go for a complete diet, Goggle, best complete for a working dogs.
There are some good ones about, orijen is just one of many, but read what's in the ingredients, if any mention of cereals in the first two lines I would avoid it, and some well know expensive ones can be just as s##t as all the cheap ones.
If I've ever had to use a complete always orijen, they do three different meats red, white, and fish.
orijen red ingredients.txt