Walking is a great way to bond the pack. Just like cdawnfine said. We've had a little trouble getting Boo to interact with Yogi. I get down on the floor and 'rough house' with them and help be a bit of a buffer for Boo. I made sure that Yogi didn't bully Boo, as puppies sometimes can. The last month or two I've noticed Boo initiating play with Yogi, so I've great hopes that a true bond will develop. Unfortunately for poor Boo, both Yogi and Gracie Ruth love to rough house and he usually gets it from both of them at the same time.
But he's a big boy, 10 lbs, and can fend them off pretty well.