Alfie Pet by Petoga Couture - Woody Head Collar and Leash Set Please note that this listing is for the size: Large. Best fits 10" mouth circumference and 12-16" head circumference. We highly recommend you measure your pet precisely with a flexible tape measure to ensure the best fit. Contact us if you have question. We are happy to help. This set comes with a collar and a matching leash. Feature a sturdy D-ring for easy leash attachment. Stops excessive leash pulling and prevents other unwanted behaviors like lunging, jumping and barking. Provides immediate, gentle control. Does not cause choking and is painless.