Vegetable-tanned leather, handmade Width: Approximately 10mm Thickness: 4.0mm Length: 54cm (excluding hardware) Head opening: 49cm For those who purchase, I will include materials on how to use a choke lead and choke collar. I will also include materials on training methods I used for two flat-coated retrievers, including how they learned to walk off-leash (though they usually use a choke lead, etc.) and stay within 50cm of me, and how I trained a dog that bit my husband's lip four times. Dogs that can maintain eye contact (releasing the happiness hormone, oxytocin, which enhances communication skills in both parties) are easier to train. The dogs that could walk off-leash looked at me once every 15 seconds. I will also include training methods to achieve this. You can train a dog at any age. Research shows that dogs are unique among animals in that they maintain the brain flexibility of a puppy even as adults. This is a factor in their evolution from wolves. Recommended widths: Up to 15kg: Approximately 10mm or approximately 12.5mm 15-28kg: Approximately 12.5mm or approximately 15mm 28-35kg: Approximately 15mm or approximately 17.5mm 35kg and up: Approximately 17.5mm or approximately 20mm 15mm is generally optimal for retrievers Leather leads are safe because they are less likely to slip when pulled and do not burn due to friction. Therefore, they are also safe for dogs. *Ideal for training. When you learn to use a choke collar correctly, you can not only control your dog but also build a relationship of trust. You can also control large dogs with your wrist. (I will include instructions on how to use it so that you don't pull on the dog for the dog's health.) *The basic rule is for the dog to walk on the left side of the person holding the lead. Use the choke collar and lead to give a cue so the dog comes to the correct position next to your left knee, and then loosen the lead when they are in the correct position, allowing the dog to think about what to do. (As a precaution during walks, when passing cars, people, or other dogs in the city, the person holding the lead should step between their dog and the other object.) If you comment with your desired type, width, and length, I will try my best to accommodate your request. #DogCollar #VegetableTannedLeatherCollar #TrainingCollar #Collar