Thomas is on wet food as his main but he does have a little bit of dry in his treat ball. He was having applaws chicken dry but this time got him the salmon and chicken. Introduced it slowly and he only has a couple of handfuls a week in his ball anyway but I guarantee after he has had some he has wet poops. Why would this be when he's fine on the plain chicken flavour? Annoying as I may have a full bag wasted. Do you think it's maybe an allergy to something ?