Dell and John take their job as watch dogs very seriously. In fact my husband refers to them as Homeland Security.
They constantly monitor our yard for invading hordes of deer, squirrels, and UPS trucks. They have no quibble with the UPS delivery staff, but the trucks are another story. It must be chased away from the house every single time a package is delivered.
If no threat is detected from inside the house they will survey the yard from the door way before launching themselves down the stairs and onto the lawn.
In the picture here I'm not sure what exactly they are looking at, but I can tell you they are at full alert.