If you just feed your dog meat it won't get the nutrition it needs. Unlike cats, which are obligate carnivores, canines are not strict obligate carnivores. Coyotes (and foxes) for example also eat wild fruits. What Do Wolves Eat - Diet "Wolves are carnivores (meat eaters) but they will eat other foods as well. Their diet ranges from big game, such as elk and moose, to earthworms, berries and grasshoppers."
Grasshoppers are carriers of tapeworms so don't feed that to you dog. 
A lot of dog food has corn added. Dog owner who buy dog food with this filler are wasting money since the corn passes right through. My dog likes hard deer corn. He got into some and it gave him diarrhea.....in the garage. 
I buy dog food from Tractor Supply. The brand is Taste of the Wild Taste Of The Wild at Tractor Supply
It ain't cheep but there's no fillers so it seems to take him a long time to eat a bag.
Would I be putting a grain-feed cow on a fad diet if I took it out of the feedlot and put it on pasture eating the grass nature intended?