A dog collar is a piece of equipment worn around a dog's neck. It serves several purposes, including identification, control, and safety. Many collars have a tag that displays the dog's name and owner's contact information, which is helpful if the dog gets lost. Collars come in various materials, colors, and styles, allowing pet owners to choose one that suits their dog's personality. In addition to identification, collars can be used to attach a leash for walking. Some collars are designed for training purposes, helping to correct unwanted behaviors. Overall, a good collar is essential for any responsible dog owner.