The dog who knows a thousand words -- Goodbye -- Christmas in June -- Let the puppy be a puppy -- "You've got to name her Chaser!" -- Chaser learns what not to chase -- Listening to the farmer -- Learning by playing -- Herding words -- Herding sheep -- Advanced lessons -- Getting published -- Going viral -- Chaser takes a bow -- Chaser goes to Washington -- Expanding the conversation -- Epilogue -- Appendix: Chaser's toys.