First of all are you SURE the toy is completely out of his system? Did you have the vet do an x-ray? An obstruction could be causing the upset… If you are sure it's NOT the toy, then yes I would agree that the food is causing the diarrhea. You can check on www.dogfoodadvisor.com for dog food ratings. I can't get Earthborn for my dog where I live so I use PetFlow to have it sent directly to my house… it's very convenient and w/the auto-ship I NEVER run out of kibble. For the meantime you can give Bentley a tablespoon or two of pure pumpkin (NOT pie filling) to help w/the diarrhea. Whatever you decide make sure you gradually change his food… this can make things get worse.