I shot two coons in traps this morning. I put the 22LR to the mesh opening nearest the head and fire...they are usually dead in less than 5-10 seconds. I have taken a few wires out in a couple of the traps but it doesn't hurt the efficiency of the traps as badly as the coons so. One of them is about 15 years old and still going strong. I bought two more last weekend (total of 5 now) because the wild critters are so bad this year with the drought. Good luck with your fox. I did catch one in a larger have-a-heart a few years back. Sardines make excellent bait (oil packed)!