any hawk whistle will work..i use a hawk scream for alot of things in michigan.
I use it when pheasant hunting if the birds are really spooky..one blast and they will sit tight.
The same applies to rabbits...if they run before the dogs even get close to them.
I've tried it a few times fox/yote hunting, i gave a couple screams and they went into the rabbit blues..it seems to work, seems more realistic to me. One thing, a old trapper told me if you use a hawk scream point the call to the sky..that way the sound is broadcast and not so easily pinpointed to a spot on the ground. -good luck, drew