I'm another fan of Royal Canin Yorkshire. 
All my three are on it, from my 11 month old to my oldest who is 13 & has always had a very sensitive stomach, which is worse now as she's got older & has other health problems. It's the only thing she can tolerate now, even boiled chicken & rice disagrees with her.   
My younger two get cooked chicken with a few veg, scrambled egg or cottage cheese for a change.   
If you don't want the Royal Canin, I have one of my Skye Terriers, she has a stomach that plays up, on James Wellbeloved. I've always found that's well tolerated in the past with others.     |