Be careful with Euk and Iams… it has lots of corn used as a filler.... and >>corn has nothing to offer other then a filler... in Iams.. corn is the second >>listed and I think, if I remember right Euk it is like 4th or 5th....
The quantity of corn, etc depends on the particular food-type {ie, puppy, low-fat, mature, etc}, not the brand, per se, although I do get your point.
But I really do wonder, what difference it makes? I mean, like I said, we've {and my family/siblings, etc} fed the supposedly "lesser quality" foods {Purina, Pedigree, etc}, and our dogs have always lived long, healthy, active lives. Actually, our cats, too -- my first cat lived to be 18, and we currently have a 14 yr old cat who is still going quite strong.
And vets have always commented on the health and good shape of our pets -- which makes me laugh because the vets also always caution against feeding "low-quality" foods. The youngest I've ever had a dog die was a corgi-mix at about 6 yrs of age, but he had to be put down due to a back injury.
So, in the long run, what difference does it make if the food has those "useless fillers", if it provides adequate nutrition and the animals stay strong, healthy, and active well into their teen years?
Don't shoot me, I'm just askin' . . .