Unique patented design works by gently directing the dogs head, steering him into the desired position, just as a headcollar works to steer a horse. Naturally following the contours of a dogs face and positioned well down the dog’s nose, the HALTI gives you maximum steering power and control. The particular advantage of the HALTI is its unique on-off muzzle-closing effect: when the dog attempts to lunge forward or attack, his jaws are closed by the slip ring. When he is relaxed or friendly, he can pant easily. The soft material and careful design and construction ensures the HALTI is comfortable and in many dogs can create a pronounced calming effect. The HALTI makes training and behaviour modification of dogs practical and safe. It can be used in a number of ways: either as a passive means to simply stop dogs pulling or as an active training aid. Millions have been sold worldwide to grateful owners of pulling dogs. Measurements: 12-15in/30-38cm (Size 0), 12.5-16in/32-41cm (Size 1),