"The cue for a dog to perform a desired behavior normally comes directly from a person, in the form of a verbal request, a hand signal, or both. An "environmental cue" comes from something in the environment. For example, the ring of a doorbell is the cue for a dog to go lay on his bed. Of course, dogs are not born knowing that a doorbell is a signal to go to bed - in fact, most seem to believe it is a cue to run to the door, then jump and bark like a maniac! Dogs must be taught to understand what a specific environmental cue means and exactly how to respond."
- Nicole Wilde, Author & Canine Behavior Specialist
Jeff Dentler, CPDT-KA, IAABC-ADT, FFCP, CTDI