Yup I had problems with Fox killing my hens. I built a 6 foot tall solid wood fence, highest allowed by by HOA. To my dismay fox was able to climb over the fence with ease day and night. So I resorted to killing the fox which entered within my small fenced yard. I took out 9 fox inside my 3rd acre fenced yard within a year. Not to waste the animal, I saved the hide and cooked the carcass and cut it into small morsels as treats for my hens. My chickens go crazy over the cooked meat. I discard the internals and grill, or boil the carcass which renders more hen treats. Feed the well cooked meat to my flock in moderation. My girls seem to enjoy the fox meat over whole grain bread.