You know, from the way #3 is written, I'm not entirely certain it's not an actual service animal -- up to and including a guide dog or epilepsy monitor. Sure, it's possible the friend just brings the dog because it's new, but there's a chance the LW is one of those people who doesn't "believe in" support animals. Especially emotional support, honestly.

I mention it because the friend's language would absolutely fit a service animal situation and many LWs would go out of their way to clarify if it isn't a service animal, y'know?