The panic snap is an essential piece of kit when skijoring or running with your dog in an activity such as canicross (sometimes called Cani-X).
In an emergency situation, it may be necessary to quickly release yourself from your dog; using a panic snap allows you to pull the sliding locking joint back allowing the line to be released. This mechanism works even under tension.
The panic snap is also used in dog sledding and dryland mushing to secure the snub line to stationary objects (such as trees) while teams are untangled on the trail.
Please note some Canicross organisations require the panic snap to be attached to the belt as opposed to the line. The use of a carabiner through the belt clips and attached to the panic snap allows the lines to be connected to the quick release mechanism.