I bring my dog to every session, so I'm glad she doesn't bring hers. Mine is a certified therapy animal, though, and very well behaved. Once he gets his cookie from my therapist and checks around for leftovers, he lies down and that's that. Sometimes, he will vocalize to her and wave his paw in the air to get her attention when I'm distressed, but he is not distracting otherwise and is wonderful to have there.