You could either: 1) set the motion detection area only on the lawn 2) Set a delay for like > 30s movement 3) Set times of movement (ie. when they're at work)

You could either: 1) set the motion detection area only on the lawn 2) Set a delay for like > 30s movement 3) Set times of movement (ie. when they're at work) But the big question is: did it work ?