My dog currently has an upper respiratory infection and he isn't eating or drinking much at all. I tried putting some Vita Gravy on top of his food, with little success. I'm concerned because he is supposed to take the antibiotic with food. I am thinking about switching him to canned dog food (i.e. Wellness) just to get some protein and moisture in him, but worried it would just give him an upset tummy. He's eaten about 1/2 cup over the last 3 days. He is 27 lbs. and on Taste of the Wild. Thanks for your suggestions.