This was a super helpful thread. For those who have a dog that definitely can't tolerate raw chicken, try turkey, quail, or duck. Those might be a good way to start with PMR. Although, depending on the severity of the allergy, turkey and quail might also cause issues. I started with chicken, but I'll share a little about my dogs in case it can help others.
I started my dogs on raw 10 months ago. Dino, my black and tan, went through what I thought was a detox process. Very itchy, dry flaky skin, lots of ear wax. The girls had some flakey skin, but not as much. After a couple months of chicken I added some rabbit and quail, followed by whole piglets. For a couple months they had a mix of all four proteins and I noticed the itching lessened, but I thought it was just the detox ending. I went through my chicken supply and stuck to the rabbit, quail, and pork and only now did I realize the itching subsided at that point. Recently I restocked my freezer after finishing my stockpile and I picked up more chicken. Dino started itching a lot, and I thought it was because of the heat and fleas. We took care of the fleas, but he still itches and chews on his legs every so often. Now I realize it might be a chicken allergy (I'm embarrassed it took me this long to realize it!)
They were on lamb kibble from Canidae when I got them. They were pretty healthy, but we're putting on a lot of weight unless I cut back greatly on portions, and if I cut back they'd result to eating "leftovers" outside. Their stool was also super smelly, from the cooked lamb formula kibble. Researching ways to change this is when I found out about PMR. I briefly tried other kibble brands and protein formulas, like Fromm and Blue Buffalo (and others I can't remember). I used The Honest Kitchen with a previous dog a couple years ago, and it was good, but I knew it didn't help at all with tartar build up, which was also another concern. I switched them pretty fast from one kibble to another. Pretty much once I used up the small 5 lb bag I tried another formula, so I didn't notice if the chicken formula gave him any issues.
I'll be taking chicken out of his diet and see if the itching stops. I hope it does!