And this is the joys of puppydom - find something to plague the humans with! See how they react --- honestly, keeping calm is the best. For reactivity, see a ton of Whole Dog Journal articles on working with reactive dogs (basic - work under threshold and gradually decrease the distance).
I have a 6 mo old right now. She's fine with the dogs at the club. My neighbor's pup (who is loose all the time) - she wants to play with this one - bark, lunge, wiggle, writhe. My 4 yo thinks (and I agree with her BTW) that the neighbor's dogs should be fenced. They aren't. They won't be. We're learning to deal with it but not very well when they are up at the fence and mark in the driveway... I guess we're all a little territorial at my house!