For Toy Fox Terriers, a harness is almost always preferable to a collar for leashed walking. This breed has a delicate trachea, and the pulling pressure that a traditional collar concentrates on the throat can cause tracheal collapse over time, a condition that toy breeds are already predisposed to. A well-fitted harness distributes force across the chest and shoulders, protecting the neck while still providing reliable control.
Step-in harnesses and vest-style harnesses are the most popular options for toy breeds. Step-in designs are easy to put on and remove, which is helpful for a dog that may be wiggly or impatient during the gearing-up process. Vest harnesses provide broader surface coverage, reducing pressure points and offering a small amount of insulation in cooler weather. Whichever style you choose, ensure the harness fits snugly without chafing — you should be able to slide one finger between the harness and your dog's body.
A lightweight, flat collar should still be worn for identification purposes even when a harness is used for walks. Choose a collar that is proportionally sized for a toy breed, typically half an inch to five-eighths of an inch wide. Breakaway collars add a safety feature for dogs that might snag their collar on furniture or fencing, though a standard buckle or snap collar is fine for supervised wear.
Leashes for Toy Fox Terriers should be four to six feet in length and made from lightweight material. A heavy leather leash designed for a large breed adds unnecessary weight and bulk for a handler walking a seven-pound dog. Thin nylon, cotton webbing, or biothane leashes offer durability without excess weight. Retractable leashes are generally not recommended because they provide inconsistent tension and can allow the dog to dart into dangerous situations before the handler can react.