I agree with Rottie!! Not only that, it is YOUR house. If anyone should be gated or outside it's the cockapoo. Next time gently suggest that they leave the little guy at home (at least that's what I would do...but then I'm pretty pushy). It sounds like he REALLY needs some socialization skills. Has he ever been to obedience school? Even if he has most of the skills necessary for being a good dog, he obviously doesn't know how to act with other people and other poochies, so perhaps a class full of dogs might help...the classes that I've seen are always pretty low key.

Ok, I'm off my soapbox AGAIN! lol

Good luck and keep us posted.