This Game is meant for Boy Scouts.

whistle for each fox. 
watch for each fox.

Select a volunteer fox for each patrol. 
Give each fox a whistle and tell him to devise a special signal that will identify him. 
Foxes should synchronize watches. 

This is more fun after dusk when it is darker and more difficult to see running foxes.

Line up the foxes and have all the patrols gather.
Tell each patrol which fox they will be chasing and have that fox blow his special signal so the patrol knows which to chase.
Once all foxes are assigned to patrols, give the foxes 5 minutes to disperse into the surrounding countryside, within easy hearing range of the leader's whistle. The leader should blow his whistle every 30 seconds so the foxes know they have not gone too far.
When the leader gives the signal to begin (a very long blast on his whistle) then each fox gives his signal.
From then on, each fox should give his signal about every 30-45 seconds so the hounds can track him.
Foxes can walk, run, or crawl from place to place as they please.

Patrols listen for their fox's signal and then take off tracking him.
Patrols must remain together as a single group.
When a fox is caught, he should mark the time on his watch and return to camp with the hounds.
When all have returned, compare times to find the winning patrol.