Canagan is well known for being a brand that it proud to be entirely grain-free. This is important not just because it means that your dog food isn't full of filler ingredients, but because grains in canine diets have been linked to canine allergies from upset stomachs to itchy coats. As a result, Canagan isn't just one of the most nutritious dog foods on the market, it's one of the few dog foods which are specifically designed to be hypoallergenic in dogs. (If you're also a friend to the felines, Canagan also make a nutritionally balanced cat food.)