If you really think it's a food allergy, testing can be a waste of money in some cases. The only 100% way to know if it is a food allergy is to do an elimination diet. The vet that is saying keep her on the new food for 10-12 weeks is absolutely correct. She can have steroids if that is what makes her feel better.
Since yu've tried so many foods for long periods of time, I would if it is a food allergy at all. Lots of Yorkies are allergic to Royal Canin by the way.
Natural Balance works so well for some allergies. I guess I'd go wtih that for 8-12 weks and see if she feels better and add steroids to the mix if she needs them. They have duck and sweet potato and fish and potato. California Natural has a few that might work also. Prescription diets for allergies have a good principle behind them (hydrolyzed protein) but that doesn't work for all dogs. Something like Orijen might help also.
I personally would wait as long as possible to do food allergy testing since it is controversial and you may get false positives and false negatives. I think environmental allergy testing is more reliable. I guess if you have to go this way though if nothing is working, then I would.
Was the infection yeast?
Maybe she has a systemic yeast infection and everything is just pushing her over the top? Has that been talked about?
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