Well, he doesn't seem to be eating anything other than a nibble of canned (I've tried everything from Wellness to Blue Buffalo to Mighty Dog) but he is eating Blue Buffalo Wilderness dry kibble. Go figure. He's getting enough to eat so I'm not worried. He had to eat to take some medication, but that's done with. He's gained about a half a pound since he's been here, though he still feels incredibly light when I pick him up.
However, he now has kennel cough. Oh joy. My vet examined him and found he has bad kneecaps. They aren't bothering him and hopefully never will. He is NOT enjoying his new medication and snarled viciously at me when I squirted into his mouth. I was terrified.
I'll get some of the Blue small breed canned food and try him on that. Thanks for the tip.