Best way to socialize 12 week old puppy?

Well there are lots of things to try. Try having the dog meet your friends first. She will sense how comfortable you are with that person and be more likely to be comfortable around them. One of the most important things you can get it used to is being touched. Even if you use a collar instead of a harness, buy a harness. Then about two times a day take it off and put it on the puppy for a couple of weeks. This will get the puppy used to being touched other than petting.