Oh predator pee! why didn't I think of it before!?! that's the answer to your problem. wait'll you see this website!
contact the owner telling your varmints problem and he'll tell you which Pee you need to use.
Honest I'm not kidding, this is a great website!
Http://www.predatorpee.com
Also explain you have a Jack Russell terrier and how will that affect your choice of Pee.
when you get to the main page, click on the chicken coop picture in "pick your problem". it will take you to the chicken protection page ,which is more specific.