The neckline is a short connecting line that runs from a dog’s collar to the gangline. Its primary purpose is to keep each dog aligned in formation alongside their running partner, preventing them from weaving, drifting sideways, or crossing over the gangline and causing dangerous tangles.
Necklines are typically 15 to 30 centimeters long and made from lightweight but durable cord or webbing. They attach to a standard flat collar rather than the harness, so they do not interfere with the dog’s pulling mechanics. The neckline is not load-bearing in the same way a tugline is — it serves a positioning function rather than transferring pulling force.
In sled dog racing, proper neckline length is important. Too short, and the dog’s movement is restricted uncomfortably. Too long, and the dog can still tangle with their partner or step over the gangline. Some mushers adjust neckline lengths based on specific dog pairings, since dogs of different sizes or running styles may need different spacing. Lead dogs sometimes run without necklines to allow them greater freedom of movement when navigating turns and choosing the best trail line.