A dog collar is a piece of equipment worn around a dog's neck, primarily used for identification and control. It often features a buckle or snap closure and can be made from various materials, including nylon, leather, or fabric. Collars can also hold tags that display the dog's name and owner's contact information. In addition to identification, dog collars can be used for training and walking. Some collars are designed with features like reflective materials for visibility at night or built-in harnesses for better control. Choosing the right collar is essential for a dog's comfort and safety.