I like this one:
Solid Gold Just a Wee Bit
There's no corn, wheat, soy or poultry in it and it's more dense so the little doggies don't have to eat so much every day. It's salmon based and either of the fishy foods will work wonders for your doggy's fur.
My big doggies like the solid gold better than Wellness... But both are pretty great foods. (My dogs eat the large breed version of the Solid Gold).
Good luck. Allergies can be tough to sort out. Both of these foods (wellness and solid gold) are a huge step up from Euk though.