in the mean time to make sure he is getting the right nutrients you could give him a supplement, I use Nupro All Natural Dog Supplement for my dog. I feed her a homemade diet and it adds in all the extra nutrients she needs just in case her food is deficient anywhere. Also I have never heard a dog being allergic to eggs, a lot of times what seems like an allergy is actually a nutrient deficiency(not a vet but from everything I have found in my 100s of hours of research thats what I have found). http://www.nuprosupplements.com/nupro-dog-supplement.html
also here is a link to my blog with some easy to make grain free homemade dog food, you can leave out the egg if you feel it is necessary: http://www.calliefoodrecipes.wordpress.com
