Many people say use cheese for training treats but when I try, Leif has a badly upset tummy after. Is it coincidence? I don’t know. I’m reluctant to try again but he loves it. He does have a very sensitive tummy. Seems possibly cottage cheese and eggs too. I cut out pork as that upset him too. Do you suggest trying one at a time again please? I did have an allergy test which showed a few different grasses too.