Indiana had already been taught how to Down, but only after asking him to Sit first. If we
continue to ask for a Sit, then a Down, Indiana will form a "behavior chain", where Sit predicts
Down, and he'll Down when we ask for Sit. To prevent this we taught him to Down from a
standing position. Now we can ask him to Down, whether he is sitting or standing, which helps break that unwanted behavior chain.
Jeff Dentler, CPDT-KA, FFCP, CTDI