Key word here is LOOKS
Because that is how you train your dog to look on-field......you train it to LOOK happy when performing a routine...tail up,ears perky,dog gazing up lovingly during a focused heel etc,etc...mimicking a happy dogs posture.
Conformation Show Dogs are trained to LOOK happy and alert at all times in the Ring too!....the premise is exactly the same.....mimic a happy/alert dogs posture.
.....and that is trained without an e-collar btw.
E-Dog - 2012 WPBTCA National Championships
The time when screech owls and Bandogges howl and spirits walk and ghosts break up their graves.
Act I, Scene IV of William Shakespeare's "King Henry VI"