Sparky, our senior corgi has a VERY sensitive tummy. He's also had a bout of pancreatitis :( I tried everything including expensive vet food. We found the answer with a raw food mix called Sojos. I choose to buy the one with meat in it as it is so simple. I make up the food about once a week and keep it in the fridge.
The food is easy, smells good, and he loves it! He DOESN"T THROW UP ANYMORE! Woo Hoo!
Look it up online. I've found a local pet store just started carrying it, so I can get it locally for the same price as online without paying for or waiting for shipping.
Good luck! LaRita
My corgi has an iron stomach - will eat anything. But my retriever, nicknamed "sensi", has a sensitive stomach. I'm lucky enough that sensitive food formulas have worked for him - no more vomiting and he has even stopped having some skin issues too. We've done the salmon based formulas and they work very well for him.