Puppies regaining an appetite is always a good sign. As long as he's keeping it down and not tossing it up everywhere, he's on the road to recovery.
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Courtesy of fr0q - http://img.imgcake.com/gensagajpgqe.jpg
Punny worked hard on this! - http://img.imgcake.com/Punny/Gennypngas.png