Hi
I too have feed my cockers on Hills and also Nutro (Nutro, for a short periode only). But for the last 3 months they have all been feed on Royal Canin, medium sensible and I am amazed how much better their coats looks. All my dogs live indoors with me, and normally they gets a bit dull coats during the winter season, since the rooms are warm and dry.
As a bonus, Trudy my fussy eater, has finally found a type of food that she really likes too
Nina