I picked up a 12" sonotube the other week at Home Depot for Scout to play with and he took right to it, kept running through it like he actually knew what he was doing (thanks Karen). Here is a short video of him playing in the yard with Emma and me. [youtube=http://www.youtube.com/watch?v=pJBQrP3L574]
and a picture of Emma giving him a treat after he successfully completed a tunnel dive.