The Otterhound's combination of size, strength, and scent-driven determination makes collar and leash selection a practical safety decision rather than a purely aesthetic one. A flat collar in heavy-duty nylon or leather, sized at one and a half to two inches wide, distributes pressure across the neck more comfortably than narrow options. The collar should fit snugly enough that the dog cannot slip it over its head — you should be able to slide two fingers between the collar and neck, but no more. Martingale collars are a popular choice for scent hounds because they tighten slightly under tension without choking, preventing the classic hound escape maneuver of backing out of a loose collar.
For everyday walks, a front-clip harness is strongly recommended over a collar-only setup. Otterhounds can pull with considerable force when they catch an interesting scent, and a harness redirects that energy without placing strain on the trachea or cervical spine. Front-clip designs steer the dog's chest toward you when they pull, naturally discouraging the behavior. Back-clip harnesses are more comfortable for the dog but offer less pull management, making them better suited for dogs that have already developed good leash manners.
Leash material and length matter for a dog this strong. A six-foot leash in thick nylon webbing, biothane, or leather provides reliable control without being so short that the dog feels restricted. Retractable leashes are generally not appropriate for Otterhounds — the thin cord cannot withstand a sudden lunge from a 100-pound dog, and the variable length makes it difficult to manage the dog in traffic or around other animals. A standard fixed-length leash with a secure, heavy-duty clasp is the safest option.
For off-leash or semi-off-leash environments where the dog is being trained on recall, a long line of 15 to 30 feet provides freedom while maintaining a safety connection. Long lines are particularly useful during scent work training or in open fields where the dog can explore without the risk of disappearing over the horizon after a scent trail.