The Beaphar Gentle Leader dog collar is an accessory for dogs that will allow you to handle and walk your dog in a pleasant way without jerks or shocks. It is adjustable thus providing greater comfort for the animal, it also contributes to the training of the dog or puppy in a fast and pleasant way, making it respond quickly to basic commands. It is used and recommended by professional trainers and veterinarians. It is the perfect accessory to prevent the dog from pulling on the leash. Thanks to the design of the Gentle Leader, when the dog pulls on the leash, his head is pulled in the opposite direction, thus moving him away from the point where he was headed and his attention is focused on the owner. This, is a natural way to remove him from the bad habit of pulling on the leash. Features: - Allows the dog to be handled and walked in a pleasant way. - Avoids jerks and shocks. - Adjustable. - Comfortable for the animal. - Promotes a quick response of the animal to basic commands. - Made of flexible nylon. Size guide: S - for small dogs and puppies: westhiland,Yorshire,Jack russel,shit-zu. M - for medium dogs: Cocker,Labrador,German Shepherd,Boxer,Doberman,Bull terrier L - for large dogs: Rotweiler, Great Dane, Newfoundland, Bernese Mountain Dog, Bernese Mountain Dog.