A pet trainer is a professional who teaches animals, primarily dogs, how to behave properly and follow commands. They use various techniques, including positive reinforcement, to encourage good behavior and discourage unwanted actions. Pet trainers often work with pet owners to help them understand how to communicate effectively with their pets. Many pet trainers specialize in specific areas, such as obedience training, agility training, or behavior modification. They may also offer group classes or private sessions. Some trainers are certified through organizations like the Association of Professional Dog Trainers or the Certification Council for Professional Dog Trainers.