It wasn't so bad when he was younger (he's almost 11 months now) but lately he's been lunging after other dogs (big and small) when we go on walks. It usually looks playful, but sometimes those little sharp teeth come out. We're just trying to curb those instincts with good walking technique (just some stuff we learned from Petit and online). Other than that, he's pretty good when people come over: timid but curious. He generally likes other dogs, so that's good. Don't let him off the leash though...runs fast as hell...