Halti Large Optifit Black Dog Training HeadcollarThe soft material and careful design and construction ensures the HALTI is comfortable and in many dogs can create a pronounced calming effect. Suitable for dogs of all ages. 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. Approximate Dimensions (Product): Neck size 40 45cm HALTI has become the world's favourite canine Headcollar because it has been designed to combine maximum