To prep your dog for trick-or-treat night, start training 2–3 weeks ahead. Focus on desensitizing your pup to costumes and doorbells, practicing polite greetings, teaching a strong “place” command, and planning safe leash walks away from overwhelming crowds. Make sure any costume is comfortable, non-restrictive, and safe, and have a backup plan—like a quiet room or crate—if your dog becomes stressed.