By consensus, the best bait for either a grey or a red fox is a female fox. A trapper named Arthur Robert Harding, writing in 1906, suggested cutting "out the entire sexual organs" of a female fox and placing "them in a pint of alcohol, and the result will be the best scent ever made." If you don't happen to have a female fox almost any slightly decayed meat will do. The most attractive of these meats taste and smell like something the fox is familiar with, such as muskrat, mouse or chicken.
How to trap foxes
Bait six mousetraps with peanut butter or cheese in a location you believe has mice. Inspect the traps twice a day. Collect six dead mice.
Place each mouse in a plastic freezer bag. Freeze the mice in the plastic freezer bags.
Cut each frozen mouse into thirds with a heavy knife or cleaver. Put the dismembered mice in a 1 litre (1 qt.) glass jar. Seal the jar. Wash your hands.
Set the jar in a warm place outdoors that is well away from your residence and that is unlikely to be disturbed by curious predators. Allow the dismembered mice to putrefy for up to two weeks. Dismembered mice will putrefy faster in summer than in winter.
Open the jar. Cover the putrefying mice with vodka. Close the jar. Let the bait age another week.
Place a cage type trap or a leg trap in a location you believe is inhabited by foxes. Spray the trap and the area around the trap with no scent aerosol spray. These sprays, sold under several names, are used by hunters and trappers to conceal human scent.
Camouflage the trap with leaves and other ground litter. Camouflage the interior of cage traps with ground litter.
Open the jar of fox bait and pour some of the liquor around the trap. Set one of the dismembered mouse pieces behind or under the pressure pan of the trap.
Close the jar. Check the trap twice each day, and relocate it if you do not trap a fox within a week.