What is the best way to train a dog to fetch a broom?

To train a dog to fetch a broom, use positive reinforcement by rewarding the dog with treats or praise when they interact with the broom. Start by getting the dog comfortable with the broom by letting them sniff it and play with it. Then, gradually introduce the concept of fetching by encouraging the dog to pick up the broom and bring it back to you. Repeat this process consistently and patiently until the dog understands the desired behavior.