for the past forever, ive been using shipping pallets as fencing because it's free and easy. the only problem i've had is having to bury 2 feet of it into the dirt and then my roos jump right on over. i've seen people cut of the branches of willow shrubs and stick'em in the ground to make a hedge and i though "hey! what could dig through that?" the roots of the willow in our area branch out and make a tighly-woven web-like barrier between the topsoil and the gravel underneath. i'm hoping that this will stop foxes from digging. we have Coyotes and Wolves but they shy away from people. i've never seen or heard of seeing any in town, so they won't be a problem. just the foxes. here is an illustration. please tell me what you think, and if you've tried it has it worked for you? your comments will be much appreciated!