Canicross is the sport of offroad running with your dog. 

Emphasis on offroad, tarmac is too unforgiving to a dogs paws and joints, and will shock the legs, causing pain and even long term damage.

The sport originated in Scandinavia, with mushers running their sled dogs in the summer months, to keep them fit for the winter. It has since grown in popularity as a standalone sport all over northern Europe. As it's spread geographically, it has also spread to include more dogs than huskies. Any breed can run, even little Jack Russell's love to get involved. 

The Sport involves using kit to not only keep your dog under control, but keep it ergonomic, safe and keep the dogs welfare in mind.