Just remember: even old dogs need continuing socialization. (samthedogtrainer.com)
Once your puppy has received the proper vaccinations, it's time to explore and enjoy the great outdoors and to continue socialization in puppy classes, dog parks and dog walks. (dogstardaily.com)
First off, it is important to socialize all puppies with other friendly dogs, and to continue that socialization throughout the life of your dog. (samthedogtrainer.com)