He’s been happily eating from for 5 years. Suddenly in the middle of a bag he sniffs and backs away from his dinner. Has happened for a few nights. I know he’s hungry and wanting dinner. He also gets a few spoonfuls of canned mixed in. Last night I had a small bag of orijen which I mixed with the rest of the same can food. He gobbled it down. So it was definitely the Fromm dry large breed. Not sure what’s going on. Should I change brands?