Also want to add, if she is producing eggs, you can cook them up and feed them back to her. That is what I do when I am medicating any of mine.
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Sorry to hear of the hawk attack. I read thru this thread and it looks like you have received very good advise & are headed in the right direction.
You had asked if anyone had seen bone exposed. I have! Couple years ago I had a partridge cochin attacked by DH's English Setter (bird dog-I know! Don't ask! LOL!) Anyways, the hen "Fur Foot" had organs and bone exposed. I thought for sure she was as good as dead. The dog attacked her back end area. Her tail was gone & all around the tail area were gashes some as big as 1/2"-punctures from the dog's teeth. I simply used hydrogen peroxide cut with water to cleanse the wounds daily & triple antibiotic ointment. I also used iodine-sometimes. I had her isolated in a dog crate outside. I didn't give her any meds, but that is just because she showed improvement. My advice to you, that I didn't see mentioned yet, is watch for maggots-not sure where you are located. My incident occurred during a cold time here, so I didn't have to worry about that. The wounds will turn blue & black from bruising. At one point, I thought Fur Foot had gangrene. And I was almost ready to cull her. (Glad I didn't). She even had a strange odor to her. The wounds developed hard crusty scabs that later fell off. In the end, about 4 months later, she had made a full recovery. Please keep us updated with your hen.
In this type of wounds disinfecting is no enough! You most put an antibiotic ointment on the wounds.and evan give here some antibiotics orally. the wound can get a bacterial infection!