[generuso]

That is a rare level of cunning!

A simpler, somewhat common version is when one dog pretends that there is something interesting outside, so that the other dog would drop the toy and would run to the window hoping to bark at the mailman, while the trickster picks up the left behind toy.

Some dogs actually learn to see through this ruse. It can be very amusing to watch them darting instinctively, then suddenly realizing what is about to happen, returning back to pick up the toy and only then going to the window more leisurely.