Choosing a collar for the Cornish Rex requires attention to the breed's slender neck and delicate skin. Lightweight collars made from soft materials such as leather, satin-lined nylon, or stretchy elastic are preferable to stiff, wide options that can irritate the skin or damage the wavy coat. A breakaway safety collar is essential for any cat that might catch the collar on furniture, branches, or other objects — the release mechanism prevents choking in the event of a snag.
Harness training is particularly rewarding with the Cornish Rex, as the breed's sociable and adventurous temperament makes it one of the more receptive cat breeds to leash walking. A well-fitted harness distributes pressure across the chest and shoulders rather than concentrating it on the neck. Vest-style harnesses work especially well for the Cornish Rex because they provide broader coverage and are harder for the cat to wriggle out of, which is important given this breed's flexible, slender body.
When fitting a harness, ensure that you can slide two fingers between the harness and the cat's body at any point. Too tight and it will restrict movement and cause skin irritation; too loose and the Cornish Rex's narrow frame will allow it to back out of the harness entirely. Adjustable straps at multiple points — chest, belly, and neck — provide the best customization for this breed's unique body proportions.
Leashes for harness-trained cats should be lightweight and no longer than six feet. Retractable leashes are generally not recommended for cats, as the sudden tension when the line reaches its limit can startle the cat and the bulky handle is difficult to manage if the cat bolts unexpectedly. A simple nylon or cotton webbing leash with a small, lightweight clip provides the best control and comfort during supervised outdoor excursions.