Terrible flatulence and lack of appetite

Since switching over to Karoo in September, our dogs have had terrible flatulence, and they haven’t been too keen on their food - the past couple of bags especially. The last bag we bought in March should be finished by now, but there is still 1/3 left, and that excludes all the food we’ve discarded that was dished up and not eaten. The past two weeks our one dog has also had multiple vet visits with ****** diarrhea. We’ve changed them over to Ultra Superwoof and they are doing much better. I’m not convinced that Montego Karoo is a Super-Premium food as claimed.