Hi Aastra,
The only way to diagnose food hypersensitivity is by a food elimination trial. I think Ultamino is a good choice to use for a elimination trial. You can read about food allergies and doing food trial here https://veterinarypartner.vin.com/default.aspx?pid=19239&id=4951526
Be aware of anything that crosses your dog’s lips. Sources of food triggers that you my not think of could include capsules from medications, sources from scavenging outside, stool consumption from cat boxes or other dogs in the house etc.
Doing an elimination trial correctly is challenging. Good Luck!
