Steroids are absolutely necessary in some cases. We all must be careful not to assume they are always bad...and be careful about stopping them just because someone thinks they are bad.
My Cookie has lymphangectasia, a protein losing enteropathy, and she has been on a low dose of prednisone for a year now. It is given every other day now so that she will not develop the signs of cushings. She also is on a special home cooked diet that was formulated by a veterinary nutritionist. These two things are keeping her alive!!
OP, please be very careful about making decisions at this time regarding the meds your vet has suggested. I would suggest that you sit down and discuss the meds with your vet rather than to assume they are bad and then to off to a holistic vet. I am not saying there is anything wrong with holistic viewpoints....just saying that conventional med is sometimes very necessary.
Sure, steroids have their issues, but what they can do in terms of healing is phenomenal. I have had other pups on steroids who suffered NO ill effects from them.
OP, also, Hill's ID is a good food for now for your pup. After your pup is doing better, I am quite sure your vet will discuss other foods with you. It might be a good idea for you to do a consult with a vet nutrionist. Here is a great website about dog food that is published by a vet nutrionist...there is some very helpful information on this site!
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Good luck and please keep us posted.