Genuine Leather Dog Harness, 37"-45" Chest, 1" Wide Straps. XXLarge. Newfoundland, Mastiff Made of genuine leather 1" wide. Features nickel-plated hardware, heavy duty D-ring. Strong and durable. 5 adjustable straps. Lighter weight. Allows the dog to have relaxed movement of muscles. Makes it flexible and efficient. Chest girth: 37"-45". Neck Girth: 26" - 34" Please measure your dog carefully to insure this is the correct harness size before placing the order