I always think of it as a dog knowing three languages.
1) His "Canine Sign Language" (body gestures and postures, stares, ear/tail movements, nose-licking, yawning, etc)
2) His "Canine Verbal Langauge" (barks, moans, groans, whines, and other sounds)
3) the language his handler speaks to him (responds to commands, tone of voice, directions, handler's body gestures, eyes)
1) His "Canine Sign Language" (body gestures and postures, stares, ear/tail movements, nose-licking, yawning, etc)
2) His "Canine Verbal Langauge" (barks, moans, groans, whines, and other sounds)
3) the language his handler speaks to him (responds to commands, tone of voice, directions, handler's body gestures, eyes)
