Best thing for laying wire/cable with a tractor is a subsoiler - looks like a very narrow plow - most are 3-4 inches wide, and when mounted to the 3pt. can be adjusted to whatever depth you require, up to ~ 14 inches on my unit (I have no idea how far below the surface a dog containment system must be - probably not too far - low voltage). They are cheap, and in my region there's a lot of used ones. Anyhow, feed the cable into the narrow trench (just run the spool along the trench and push the wire through the loosened soil into the depth - some have a hollow tube on the back of the subsoiler to feed cable - see prior posts), then drive the length of the trench, with a rear wheel over the trench - no more trench, wire is buried, and the depression is minor. Now, if you need to run larger pipes, etc., then it gets complicated - potato plow, trencher, etc - if you need to bury something over 14" deep, as in water pipes up North, then it really really gets difficult without a trencher, backhoe or whatever.