Jim,
Crash, our dearly-departed Golden, would run out the back door and leap into the middle of the pool any time of the year and any time of the day. And he would just motor around it for hours until I pulled him out exhausted. He was truly a water dog and would have been swimming every day if we let him. Rotties will swim -- and most of mine love it -- but only when allowed in and usually with someone. We used to do alternate retrieves with tennis balls with Annie and Rowdy and each knew when it was "their turn". Annie would occasionally race Rowdy to the ball and steal it from him -- and he'd let her -- but mostly they'd play nice.
Great series of Ollie. The lighting is lovely.
Jim