Fancy taking the lead? Canicross is where a runner is strapped with a bungee cord to a dog in a harness as it races across trails. It's the latest fitness craze and while once it was enough just to walk your dog, now increasing numbers of dog owners are being taken by their pets for a powerful run instead. As a result, a plethora of canicross events have sprung up offering runners and their dogs a wide choice of events to choose from.