I have a Great Dane (155 lbs). When I was feeding him grain-free kibble, I fed Earthborn Holistic Primitive Natural (very low fiber), Annamaet Grain Free, Go! Fit & Free (by Petcurean), and Acana Regionals (grain-free). I also have a rottweiler in the house (my brother’s dog). The rottie has done well on Horizon Legacy, Horizon Pulsar, Fromm Adult Gold, Acana Regionals, and Nutrisource Adult Chicken & Rice.
Fiber could be the culprit. The rottie is very sensitive to fiber in his food. Too much fiber makes him poop his brains out too. You could try the Earthborn Holistic Primitive Natural. It has 2.5% fiber which I think is pretty low for kibble. Also, not all dogs do well on “5 star” foods. It really depends on the dog. I wouldn’t give up on grain-free foods just yet. I would try another brand like Earthborn or Nutrisource.
Good luck and let us know how it goes.
