Julius-K9 IDC-Powerharness Blue for Dogs is a comfortable harness to keep secure around your pet, preventing them from pulling.Key Benefits Suitable for all breeds Durable Comfortable SecureHow to Use Pace four fingers behind the dogs front legs for harnesses sized Mini-Mini to 1. Roughly for small dogs there should be 1 inch behind front leg and for medium and large dogs there should be 2 inches. The finger furthest away from the front legs is where you will be measuring the circumference of the dogs chest. Use a fabric tape measure to wrap around the dogs chest. The tape measure should be snug, without being too tight or baggy. The dogs chest size is where the end of the tape measure and the remaining portion meet.Sizing Mini-Mini | 40 - 53cm / 15.5 - 20.5in Mini | 49 - 67cm / 20 - 26.5in 0 | 58 - 76cm / 23 - 30in 1 | 63 - 85cm / 26 - 33.5in