First step: Had target towel, that had to go and lie down on. When went and lied down on, would get treat. Soon learned, was always to lied down on towel.
Third step: Jacinta took step back from towel and called. Had to learn, was not to lie down near feet. Was to lie down on towel. Took steps farther and farther back.
Fourth step: Made towel smaller and smaller. Folded up until could not fit on towel. Had to lie down near towel.
Fifth step: Was most difficult. Had to learn, was not only to lie down when saw towel. Was only to lie down when heard "down" command. Sometimes Jacinta would call and not say "down." Then was to come to feet and sit. Is still a bit complicated.
Sixth step: Towel got taken away. Pattern in training session was like so. First time, call with towel but without down. Second time, call with towel but without down. Third time, call with towel and with down. Fourth time, call without towel and with down. Then is training session over, and try all again next session.
Then, is "drop on recall" learned! Observe.