Read on Leerburg.com about their take on socialization. I want my dogs to look to me when out and about. If you think they need to interact with people, then I would work on the puppy sitting first. Mine do better greeting standing, but neither were big jumpers as pups. Denise Fenzi also has a great you tube video out working with an older dog that is a chronic jumper. If you have someone to help you.
dogbyte Cathy, Rossi ( the Dutch shepherd) and Gunny (the Czech/DDR GSD) with Zoey, Chance,Xara,Gracie, and Jaden snuggled deep within my heart