Bob was Phoebe's house rat in Season 9. As Mike moves in with Phoebe, he is startled by the presence of rats and advises Phoebe to set up traps. Phoebe, however, states the rat Mike saw is named Bob and that Mike is eating Bob's crackers. Mike manages to convince Phoebe to set up traps, but Phoebe is initially unaware the traps will kill Bob.