Hi Zoey,
I have 2 tzu's and 1 of them has atopic dermatitis,she is allergic to grass :( supplementing with omega 3's helps a great deal,both my girls get vit.E,evening primrose oil,salmon oil and alfalfa,they also get weekly baths,one has no choice with long haired dogs

we walk by the river everyday,each time they go swimming and then roll in the mud,they get really icky,i really should be bathing them everyday but i doubt that would be very good for their skin.
A friend of mine had a gsd who was constantly itching,so he had all the allergy tests done,cost him hundreds of dollars and it ended up that his dog was also allergic to grass,it helped him identify the allergy but there wasnt much he could do about it as everywhere we go has grass including his backyard.One other thing that has practically eliminated my girls itching are antihistamines,i use a brand named "polaramine" i'm in Australia so you may not have the exact same brands as us,my vet said that any anthis. starting with the letter P is safe to give dogs.
good luck
let us know how you get on.
Edited to say: One book that has helped me immensly is "the natural health bible for dogs and cats" by Shawn Messioner,i would reccomend this book to anyone who is interested in natural healing,it includes a list of over 200 herbs,their uses and the doses to give,it also has just about every disease your pet can get and the therapies to help,absolutely brill. it is available through Amazon.
christine :)