We figure we have two weeks or so of intensive training on the invisible fence, so she's house and leash-bound for now, but she's settled right in. As I told some other folks - Murphy needed a pet.
They've listed her as a lab mix. I feel reasonably sure she has some boxer in her, too. She has four white feet and a white chest and tummy. She's a cuddler, too. So far, only Cosmo seems to be slightly offended - but not unpleasant.