We had the same issue with our two lab mixes and Orijen. It wasn’t an allergy or anything so extreme, just too much protein. We switched them to Acana (a bit higher carb and less protein) and they have been fine ever since. I thought of the allergy thing at the time but they have had no issues with chicken or any other proteins. In fact some of the Acana selections we’ve fed include several meat and fish proteins in the same kibble. Do have the vet check them out, but keep trying different foods until you find one they will eat and they produce proper stools on. Another tip – measure food by grams with a kitchen scale, not by the terribly inaccurate “cups”! You want them to get the recommended amounts of the kibble.
