Chickens will open their beaks when they get hot but in your case think it could be from the pain or stress.
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I think that it would be alright for you to clean the wounds now, you can use a blow dryer to dry off her feathers too. I read once that you can try tying cans of urine outside of the run because it's like marking your territory and raccoons respect that.
I've tried it, it doesn't work. Had my late husband try it, thinking a male scent might make the difference...nope...they could careless. The more we encroach on their land, their hunting grounds, with urban sprawl, the less safe our livestock are. There just isn't enough room for all of us anymore.
Remember back when chickens were a main stay in every back yard? There weren't the kinds of predator attacks we have today, and the ones they had, the ole shotgun came out and the problem was solved. Not today. The live traps just put the predator in someone else's back yard for them to deal with. Someone did that to my Mom...left her a nice muskrat/groundhog ( wasn't quite sure by her description which) couple, that were now, trap leery. They had babies, and the family ate all of my Mom's garden, the ornamental flowers and some deer ate the tops off all her tomatoe plants. She ended up hiring someone to take care of them, permanently. It was her food, or them...they would NOT go in the traps. Well the babies did, but not the adults that were left at my Mom's by someone that felt NIMBY...so left my 90+ year old Mom to deal with it. I don't live close enough to be of any help unfortunately. My Mom has canned her entire life, except for this year, as she has nothing to can and now will have to spend money she does not have, to supplement the canning she used to do.
I don't know what the answer is, for those that do not want to kill the predators, except to lock up their livestock, permanently.
Just some things to think about!
Sooo sorry for your poor dear hen!!!! I hope and pray she recovers!!!!