My goodness but don't they have very sensitive tummies! It was two teaspoons of yogurt I gave to each puppie and will not again until I learn more about how they both react to foods. I will only feed them their Science diet until I find out what I should be doing .... the new vets hopefully will put me on the right road tomorrow .... It seems that one of the puppies is more sensitive than the other. Joe is the heavier of the two puppies, so I am surprised. Thanks for all your advice. Pauline