I don't think so, but who knows. He's been on the same dry food forever. We added canned food to his diet over the summer and he was fine until September when he got sick with a fever for a second time (the first time was in the summer of 2010) while we were in Missouri. He eats the same handful of canned food "flavors" all the time. If the canned food was the issue, I think he would have shown signs of a problem long before September and would have never recovered from it. I also don't know that a food allergy would cause a high fever. The first two illnesses seemed virus-like. The second one seemed like he just ate something that didn't agree with him.
I dunno. The vet and I are stumped.

