I'm feeding my rottie Canidae and she loves it.

My rottie didn't do well with the Orijen 6 fish because of the high protein content (she's just 6 and half months old). Also I find that lamb and rice seems to work wonders on dogs with sensitive stomachs. Orijen is still considered a 6 star brand but some dogs might not be able to tolerate it because of how rich their ingredients are. You may try their sister brand Acana as an alternative. I've heard nothing but good things about it. Or other good brands to consider are Canidae, Innova, Nature's Variety: Instinct & Prairie, Wellness or Wellness Core, Solid Gold, California Naturals.