Sunny update: the vet ruled out mange & ringworm and while the dogs aren't on Revolution, fleabite dermatitis is very unlikely–trust me on that one. No new inhalents, and the only existing one is vinegar/lemon/baking soda spray cleaner--I banned commercial cleaners & scented products/sprays/candles from the house years ago, and we don't smoke. So that leaves food.
The Vet thinks the issue might be related more to dog food additives than protein type, and I'd say she's on the right track 'tho I think it's additives IN the protein/fat sources, too. I'm sourcing inexpensive organic mutton to do an elimination diet, although I might try organic beef first, but for now all 3 are on a mix of Medical Hypoallergic and homemade ratio 2:1:1 (protein:veggies:oatmeal). I'm transitioning them gradually to homemade, but Sunny's as itchy as ever and the hairloss is progressing. Unfortunately, Donald Strombeck's book is out of my price range at the moment ($181 in Canada) so I'll be turning to you guys for more advice!
So, does anyone have an opinion on which veggies & starches might be best tolerated? Also, he has a Hartz plastic teething ring--d'ya think ingesting tiny bits of that or a Nylabone could cause fur loss?
P.S. Sorry for the long post!