RE: Cougar?
Years back my Grandfather owned 5,000 acres. A mountian lion was killing mule deer and calves. The mountian lion was stalked and killed. The deer population came back to what is was in about three years.
I would kill the mountian lion any legal possible way. Hounds might be the best way if legal. Contact the Cattle Man's Assoiation, and your Game & Fish Dept. to start. Good luck.