Some dogs just have an iron clad stomach,and nothing upsets them. Earnhardt is like that.I have done switches with him,and no transition,and he does great.
Jasper is the same.I recently have bought another bag of TOTW,and Jasper & Earnhardt have transitioned back just fine.They all were eating it,prior to say a month ago. And I switched because Trapp was being Mr.Fussy budget.
Well,Trapp is slowly going back on it.
This morning he walked away from his dish.I gave him 15-20 minutes,and he still would not eat.So I took the dish away.He was fed at 4:30 tonite.He knew better than to walk away,cause morning time is a long time away to being fed.