Collar selection for a Newfoundland must account for both the breed's neck size and its powerful build. A flat collar in the two-inch width range distributes pressure across a wider area and is less likely to dig into the thick fur and skin. Nylon and biothane are popular materials — nylon is lightweight and available in every color, while biothane is waterproof, odor-resistant, and ideal for a breed that frequently gets wet. Rolled leather collars are another option that reduces coat matting around the neck compared to flat designs.
Harnesses are generally preferred over collars for walking and leash control. A well-fitted front-clip harness redirects pulling force by turning the dog toward the handler, providing gentle steering without placing pressure on the trachea or cervical spine. For Newfoundlands, look for harnesses with wide, padded chest and shoulder straps that will not cut into the body during sustained walks. Adjustability is critical — the harness should fit snugly without restricting shoulder movement or chafing under the legs.
Leash choice depends on the walking context. A standard six-foot leash in heavy-duty nylon or leather provides adequate control for neighborhood walks and gives the dog room to explore without excess slack. Retractable leashes are generally discouraged for giant breeds because the thin cord cannot withstand sudden lunges from a 130-pound dog and offers poor control in traffic or around other animals. For training contexts, a shorter four-foot traffic leash keeps the dog close and responsive.
For water activities, waterproof leashes and collars made from coated webbing or biothane prevent the soggy, smelly gear that comes with standard nylon after repeated swims. Some owners maintain two sets — a standard walking set and a water set — to keep everyday gear dry and extend its lifespan.