Some cities also have sales papers and coupons placed onto porch regularly,usually they are delivered by a different stranger,every day.
To perform a variation of this,changing it to personal protection(in dogs mind)...as the strangers make their rounds,stand in yard or near front gate of property with dog,while waiting for him to (momentarily)trespass.
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"