So great to hear Tucker is doing better! I've never heard of seeing a nutritionist before an allergy test, seems like first you'd do the allergy test and the nutritionist will then know what foods are forbidden! I agree..with trying a new food..what do you have to lose? I might suggest you go a bit slower with the transition. Maybe 3/4 old..1/4 new for a few days..then 1/2. And 1/2. For few days..then3/4 new and 1/2 old for few days..then all new! Much easier on their tummies! Can also add a spoonful of canned pumpkin (not pie filling).. 100% canned pumpkin..to the kibble..good luck and Tucker is such a lucky bully!!