Dog with skin allergy

My little Dreamer has a skin condition that I believe is a seasonal allergy to grass. It is a rash on her stomach and chest that starts a little red bumps/blotches and then after a couple days turns in to brown scabs and comes off. It is very itchy for her, and she also has itchy paws and feet. The vets can't identify exactly what it is, but they say the next treatment to try is steroids. I'd like to avoid that if possible because of the side effects, so I wondered if anyone had any suggestions?

So far we have switched her to an all-natural fish & veggetable food, we give her a fish oil supplement, and we wash her once a week with a medicated shampoo.

We are also thinking of digging out a small area of the garden and putting in gravel so she can go to the bathroom without having to go on the grass. I think she knows the grass is bad because she tends to avoid it and only goes on it when she has to

Your suggestions are appreciated!

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