If your dog is allergic to beef or poultry...
there are PLENTY of easily-accessible meats to feed your dogs, instead. What do you do with an allergic kibble-fed dog? Find a kibble with a meat protein that works for them. And that can often be tremendously stressful, because kibble makes an elimination diet that much harder; there are tons of other ingredients in kibble, to consider. If anything, I know tons of people who switched to Raw because their dog had allergies on all of the kibbles they had tried.
I wouldn't call Gonzo "allergic" to grains, but he does VERY BADLY on a diet with substantial grains and starches. I had no idea how healthy he could be, until I switched to Raw. I thought he would always have problems with his weight jumping around, and he would always be itchy, and he would always have plaque no matter how many Greenies I bought, and he would always shed mountains of hair (now it's more like... small mountains) and he would always have erratic energy, etc, etc.