My mal tries to herd me by jumping up and either nipping my chin or my shirt. Needless to say not a behavior I encourage but thats just her when she wants to play. One requirement for getting into K9 was having a fenced in yard. I tell the instructor in Texas, yeah, just got my yard done, 6' chainlink. She looks at me and said "oh no, you need 8 feet". Apparently these dogs are quite agile and like to climb as well.
Tulip-good luck with the training. I bet your guy would love swimming...when it warms up.