I also went to a dock diving competition over the weekend. It looks like a fun time. We didn't take our dogs but they allowed people to try it out and I'm pretty sure both our guys would love it.
It's very fun. I see it as Shala's total fun sport - no real rules, other than holding the sit at the foot of the dock until I release her. And it's a chance to do big entries into water (which she loves to do) and swim all day. What more can a dog ask for?