Can anyone here recommend a good food for dogs with food allergies?

My dog was itching like crazy and we went to the vet this weekend for
the second time regarding this problem. The vet is pretty sure he has
food allergies and said to swich to Hill's Sciend Diet z/d (which they
just happen to sell). He doesn't seem to mind the dry stuff, but the
cans he won't even look at. I don't blame him- it doesn't even look
like food, more like meat flavored Jello.

Can anyone recommend an alternative brand of hypoallergenic canned food
to give him that can be purchased at the pet store? I was told that if
he doesn't like this one that there is another brand that the vet could
sell me, but it would have to be on special order, which of course
meens more money for them.

Any help would be greatly appreciated.

Thanks