Glenn brought home a water heater box and I cut the end off it to make a TUNNEL!
I only had to throw the ball through the "tunnel" once to give Darby the idea.
Then, every time (well, nearly everytime!) I said "TUNNEL" she ran through the box! Without the ball as a lure!
Sometimes she runs through, turns around, runs back through and turns around yet again and runs through!
I took video to prove how clever she is, but can't figure out how to upload it to the blog!