I have been trying to socialize our new adopted 8 month old male with my girlfriend's black lab. Her cottage is 10 minutes from our house so puppy Zack and I have gone over on 2 weekends and been warmly welcomed by 'Ben the Lab'. Ben must weigh in close to 100lbs but he is a typical sweet laid-back Lab. He & Zack run around the property, and Ben even showed him the lake. Zack wandered in to get a stick but its a little cold for swimming here yet.
Its so nice that he can meet a doggie friend other than his sisters.
My friend is also thrilled as Ben is always looking for a playmate.
Hope I didn't butt in on the OP thread.
Just wanted to second how successful/enjoyable puppy playdates can be.