A similer thing happened to me last year.
I was at Loch Lomond February 2008, and my Labrader who was 14 months old at the time. Anyway I decided to chuck in a stick which I thought he would get but never did instead he went to this bhoy which was further out, this bhoy was anchored down and wouldnt move. But my dog would not let go of it, he wanted to bring it back. After 5 minutes of him trying to get this thing back he started struggling and started whining. onlookers was like you better go out and get him or he will drown. So I stripped down to my boxers (how embarrassing in front of