Best dog food depends on ur dog. Just like human they got their individual preferences. A good dog food is to look at their stools. It should be less than 1/4 of the amount fed. If the stools is as much as the amount fed then its a bad dogfood because there is very little absorbtion and it contained a very high % of filler.

Premium dogfood - feed less
Cheap dogfood - feed more & more shit(more work)

I changed fr Eukanuba to Blackwood.
Less shedding and a far more superior food.
My dog found it more appetizing.