Ozzy is a nearly four-year-old border collie-kelpie mix and here his owner Nick is training him to stand on a slackline.
Slacklining is similar to tightrope walking, but the rope is, well, not tight. With a less-than-taut rope, the line droops and allows for some bounce and give. The bounce lends itself to tricks and jumps and can be operated similar to a trampoline.
I've even seen slacklining in parks and places where the rope can be strung between trees here in Washington, D.C.!