It does help, we’ll just have to start somewhere and adjust till we get it right.
I want to do this, at least we might be able to find out if it was the food that was doing it.
I really think the easiest way to start “eliminating” is going to vegetarian, as I ended up doing per dermatologist vet recommendation. That eliminates like no other. Then you could try some animal proteins.
http://www.royalcanin.us/vetdiet/
Royal Canin now owns IVD, but apparently doesn’t bother mentioning it any more on the website. In their sites, you’ll find the various kinds of food they offer. In this case, you needn’t go to “Atopy” (which IS allergy), but to what they list as “adverse reaction”. Vegetarian, e.g., is listed, along with rabbit, venison, duck, etc.
This is just an example; possibly you could try readily available foods off the shelf if the dogs like it. IVD usually needs special access.
Of course, this is all in case it really is food allergy!