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Cal holds the door open for Chandler, saying,

"My dog'll probably jump on you, but don't worry, she's friendly. We're, uh, working on that." The jumping thing, that is, not the being friendly thing.

And Chandler is almost immediately, as promised, investigated by a very curious (and not very big) puggle. It's far from the first time Cal's had a visitor since getting Penny, but she has yet to figure out exactly how it is that new people manage to appear in the apartment when she knows they didn't come in through the front door.

Perhaps Chandler's trouserleg holds the answers.