I can mention a few good foods but I don't know if there right for dog who are epylipactic.
a few good Brands are
Orijen and Acana (both made by the same company)
www.orijen.ca
Wellness (which also has a special food for dog with allergies call wellness simple soloutions)
http://www.wellnesspetfood.com/
EVO
http://www.naturapet.com/brands/evo.asp
Innova
http://www.naturapet.com/brands/innova.asp
You may want to check out
http://www.dogfoodanalysis.com/ good site for dog food reviews
don't know if any of those are right but those are some of the good Brands and come grain free
