A well-fitted collar is the most basic piece of equipment every Gordon Setter needs. For everyday identification and tag-carrying purposes, a flat buckle collar or quick-release collar in a width of one to one-and-a-half inches suits most adult Gordons. Measure the dog's neck and add two inches for a comfortable fit — you should be able to slide two fingers between the collar and the dog's skin. Rolled leather collars are popular among setter owners because they reduce the matting and flattening of the long neck feathering that flat nylon collars can cause.
Harnesses are the preferred option for walking and training, particularly for Gordon Setters that pull on leash. A front-clip harness redirects pulling momentum back toward the handler, making walks more manageable without applying pressure to the dog's throat and trachea. Back-clip harnesses are suitable for dogs that have already learned good leash manners, as they distribute force across the chest and shoulders comfortably during relaxed walking.
Leash selection depends on the intended use. A six-foot leather or biothane leash provides the right balance of control and freedom for everyday walks and training. Leather leashes soften with use, become more comfortable in hand, and are exceptionally durable. Biothane offers similar durability with the added benefit of being waterproof and easy to clean — a practical advantage for a sporting breed that frequently encounters mud, water, and tall vegetation.
Retractable leashes are generally not recommended for Gordon Setters. The thin cord provides minimal control over a strong, 60-to-80-pound dog, and the retraction mechanism encourages pulling behavior. For situations where more freedom is appropriate, a long line of 15 to 30 feet gives the dog room to explore while keeping the handler in control. Long lines are particularly useful for practicing recall in open fields before trusting off-leash reliability.