I dunno
I just heard about the change myself.... I feed Jackson the Regional Red formula and he always did perfect on it. It was the dog food he did best on (in terms of loving the taste, his poops were perfect, skin healthy, hair shiny, etc, etc) and our local store was out of it for about 2 months so last week I went in and they finally had it... so for a week he's been eating the RR but some of his poops have been runny
Not all... but like once a day he will have a little runny mushy poo. I didn't do any transitioning because he usually doesn't need it so I'm going to give it more time and see how he does by the end of the bag but I'm gonna be sad if something was changed that just doesn't agree with his system :\ I hope it's just him getting used to it again- he's been eating Go! Endurance with no problems.