My 6 months old dog loves her hairy friends. She loves them too much. When there's another dog around, she plays with them, jumping and biting them. When that happens, she completely ignores us or any other people/toys around, and all she cares about is the other dog and playing with him/her.
This is a minor annoyance when the other dog cooperates and plays with her (I'd still like her to listen to me when I call her and give her commands), but it becomes intolerable when the other dog doesn't. If the other dog lashes out and bites/warns her, then she sees it as a game and just goes on pestering, but even worse when the other dog ignores her, she starts barking at him/her really loud, and we live in an apartment...
At this point I try calming her, even pulling her away and holding her, but she's so enthusiastic that she does whatever she can to get free, including biting my arms pretty hard (not aggressively though). If I put her in another room she starts scratching the door (even if I'm in that other room with her).