I throw them in the "bleed out tub" and take them on an old back road. I'll set it there for the foxes and coyotes. It's never been there more than two days without being totally cleaned out.
I would never feed them to my dog. That is just training her for a taste of chicken. I won't even feed her chicken dog food.
And leaving it out for coyotes and foxes is an invitation to dinner in my hen house.
I haven't killed any of my birds yet, but when I do, I plan to use the Salatin system of composting. Coyotes, rats, and such may get some of it, but it won't be because I intended them to.