In general, a good dry dog food should have -

No grains - they can't digest it well, manufacturers add cheap grains as fillers

No gluten - gluten is a kind of protein there are lots of it in breads especially hard breads such as baguette, it's hard to digest for both dog and humans but manufacturers add it in just to make nutritional information look good with high
protein contain

Contains healthy fat - Omega 3 6 9 fat keeps the coat healthy

and much more if you're picky, eg preservatives, flavouring etc

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