Okay, an update and collection of my thoughts so far...I spoke with anglebears on the phone yesterday (thank you again, so much!) and she told me about two products in particular that I could use topically to offer relief while we figure out the diet part. Oreganol (or oil of oregano) and witch hazel. I'd never heard of the oil of oregano, but after reading the reviews and all the different uses for it, I'm particularly excited to see if it'll help Roux's raw and painful toes/feet. The alcohol free witch hazel has been used to offer relief on dry, itchy skin... So, also excited to try that out. I'll be sure to update on my experience with this products. And, if they don't work for Roux, after reading all the reviews I'd be lying if I said I wouldn't love the chance to try them out for myself!!
As for the diet... Since I've already paid $160 for two bags of Iam's Kangaroo, I'm torn between just following through with the dermatologist's food trial (at least until I use up the two bags) or conducting my own food trial. A raw trial is most appealing to me, and makes most sense to me. I know far too many people who were told their dogs were allergic to animal proteins, but they thrive on a raw diet. And, it makes more sense to me that if I'm going to do a food trial... how could it get any simpler and more accurate than testing one, pure protein at a time?? But, my husband appreciates the convenience and ease of dog kibble, so it's going to take a little more selling to him on that front. If he can't be convinced, Smart_family has given us some great information on single protein, limited ingredient formulas and I feel confident in her recommendations.
Thanks to everyone who has offered advice, ideas, and help! If anything else comes to mind, feel free to share!