Size guide S Bust: 53 58 cm, Neck 48 cm M Bust: 60 70 cm, Neck 59 cm L Bust: 65 80 cm, Neck 65 cm XL Bust: 78 100 cm, Neck 74 cm Please measure your dog's neck and chest circumference to match the appropriate size. Key benefits and features Safe and controllable for outdoor use: safety belt designed for outdoor play, with a comfortable saddle shape, back control handle, and a padded shoulder strap. The chest circumference is adjustable to fit different types of dogs. Comfort with durable design: balanced stress distribution using a triangular design helps disperse load, making it easier to wear and reducing wear over time. Adjustable chest circumference provides a secure, full body fit. Reliable and adjustable hardware: strong POM buckle resists cold and temperatures, maintains shape, offers higher tensile strength, and is adjustable for a secure fit. Use scenarios Daily walks and obedience training: the back handle and padded strap provide confident control while keeping your dog comfortable during routine outings. Outdoor activities and exercise: adjustable chest sizing combined with stress dispersing design supports running, hiking, and park play for dogs of different sizes. Travel and outings: secure, durable construction and adjustable fit enhance safety during trips or visits where steady restraint is needed.