Several training collars are available, including choke, prong, spray, and shock collars. Each is designed with specific training goals, such as correcting unwanted behaviors. However, these collars must be used with caution and under professional guidance. Improper use can lead to physical injury, pain, or psychological stress for the dog. It's crucial to prioritize positive reinforcement techniques and consult with a veterinarian or a certified dog trainer to ensure the safety and well-being of the animal while achieving effective training outcomes.