At DogFit we have put together a complete kit for everything you need to start Canicrossing with your dog. This is same equipment that we use regularly ourselves and highly recommend.
The Zero DC Short is an excellent entry level harness or for regular runners with small to medium dogs. It’s fine for large dogs, too, if they don’t pull excessively*
Set up is easy: simply place over your dog’s head, keeping the part with the metal ring facing towards the hindquarters, before popping the front panel through your dog’s front legs and fastening both sides together under the belly. Fully adjustable straps to ensure a comfortable fit.
*For large, strong pulling dogs we highly recommend the more technical Non Stop Freemotion harness which comes in a set too which you can find here.
DogFit advise that you regularly check all clips and fixings on your canicross equipment regularly for any signs of wear and tear.