Hmmm, I've used aspirin and I haven't had any problems. I thought ibupropen and so forths weren't good for chickens? Anyway, he's a real nice chicken, so I hope it all works out.
Yes, they are way tougher than we give them credit. He is a beautiful bird and it would be nice to get some of his offspring. Now how the heck did he have a 'run in' with a lawn mower, did he attack it?