Your canine companion doesn't care what color their dog food is (they are colorblind, after all), so it's best to avoid food that is loaded with dyes. When looking at the ingredient list on pet food packaging, look out for artificial dyes like Red No. 40, Yellow No. 5 and Blue No. 2. Manufacturers often add these colors to food to make it look more appealing. Just normal brown, natural-colored dog food is fine for your pet. Artificial dyes have been linked to behavioral problems, and they have no nutritional benefit, so avoid them altogether.
ANDREWS MCMEEL SYNDICATION