To start socializing a puppy protective dog sales safely, introduce them to various environments, people, and other dogs in a controlled and positive manner. Begin with calm, low-stress interactions, rewarding good behavior with treats and praise. Gradually increase the complexity of the social situations as your puppy becomes more comfortable. Ensure vaccinations are up-to-date before exposing your puppy to public areas to prevent health risks. Consistency and patience are key for successful socialization.