The Kerbl Maxi Leader Training Harness is an effective solution to discourage constant lead pulling, whilst simultaneously protecting your dog from injuries to their neck muscles and vertebrae. This harness is waterproof and available in various sizes for a perfect fit: No.1 (25 x 30 cm), No.2 (30 x 45 cm), No.3 (45 x 60 cm) and No.4 (55 x 80 cm).