Why worry yourself over making it “dog food”? Just cook up whatever you wish of “people food” and give it to them. Sure, start with one ingredient and add others until you find the problem.
On the other hand, you might want to check if they are itching because of bug bites or poison ivy. We’ve had a very wet summer and the mesquitoes are worse than they’ve ever been. We also have many more other bugs this year too. Surprisingly, not fleas. You might also check your yard to make sure they aren’t getting into some sort of poisonous plant that they’re allergic to. There are other things than food that will make them itch, perhaps even the shampoo you’re using on them.
Well, what we’re eating isn’t always appropriate for dogs. For breakfast we usually have cereal and toast. I’m not sure that’s a workable plan for three large dogs.
I don’t think it’s bugs, I don’t think it’s contact allergies. It’s licking and localized itching mostly on the spine and base of tail. The vet advises that Thyroid issues can do this, and one dog is on a thyroid med, but that’s not the case with the other one. I do think it’s a food allergy, the vet advises too that it’s probably a food allergy. They actually seem to finish eating and immediately want to lick and scratch. It’s driving us nuts.
I would agree it’s not necessarily food. In fact, food allergies are a small % of all the allergies dogs suffer. About 10%.
Perhaps they’ve gained some inhalent allergies - atopic dermatitis.
My dog is allergic to numerous inhalents - dust, molds, ants, moths, etc. You name it, she has it (except most “outdoor” type allergens, thank God at least). Inhalents are the most common allergens for dogs and cats.