Going through the same thing with Roxy. She eats home cooked grain free food. She gets fish oil and vit E in her food. I do not use fabric softeners, and I wash with dye free and fragrance free detergent.
I do not use conditioner any more and I do not put anything on her hair other than shampoo - which I got from the Vet, it's a anti bacterial/fungal shampoo. I make sure to rinse her for a LONG time, making sure no residue is left on her.
I give her children's benedyl daily, as she needs to stop and let the skin heal.
I also give her 1/4 teaspoon of Bragg's Apple Cider Vinegar and 1/4 teaspoon of Lilly of the Valley Oral Aloe Vera Gel in her PM meals.
We have hardwood and tile and I vacuum every week.
I must say she has gotten better, but not 100% - allergies suck
