They deliver a shock through the pet's collar if it crosses a boundary, such as a wire buried at the edge of a garden.

BBC: Wales politics

That safety net would have taken some of the edge off the piano-wire-tense game against Stanford.

WSJ: Baylor Tops Kansas State, Stanford Tops Oregon: Enjoy College Football Upsets While You Can

The evening show, inspired by the dark and twisted fairytales of the brothers Grimm, is a 45-minute, adrenaline-raising performance with a lot of knife throwing, motorcycle stunts and daredevil high-wire feats to keep you on the edge of your seat.

BBC: London��s winter wonderland