Not sure I would trust it, I have fed Pedigree, Eukanuba,Purina etc. and found my dogs lke the taste (LOL) of Ol' Roy From Wal Mart, they have a nice formula, my wolf hybreds were on it for years, and kept them nice, we switched to a nice science diet formula, and were on it for a month or two, but they prefer the ol' roy. I tried Purina EN, and my beagle pup liked it, but my other dogs turned their noses at it, nibbled, but never would accept it. It's weird, cause I would of liked a nicer diet, but they would let me. I know of the Royal Canin, as my job sells it in small bags, I don't like it, and the customers generally switch off of it.