Open INnoVation Headcollar for Dog Head Collar to Prevent Dog Bite The Head Collar is perfect to help you on the training of your dog Guide the head of the dog to go where you want and the body will follow With our collar your dog will listen to you and will know the right way to go Safety loop attaches to regular collar for added security Small headcollars fit mouth circumference: 9-21cm, neck circumference: 27-35cm