Summertime and swimming go hand in hand.
I recently viewed a video of a Lab diving in the deep end of a swimming pool for its toy. By the number of videos on youtube, there seem to be many Labs who love to not only swim in pools, but dive for toys.
My favorite video is this one. The music is fitting.
My Irish Setter would go underwater to retrieve rocks in the river. I thought this was odd. Then again, she would retrieve absolutely ANYTHING!