Me neither,but I had a golden lab who came pretty close!He would actually dive for oysters in the bay where I lived and bring back a cluster gripped in his teeth!True story.
I had a golden retiever that would stay in the water as long as you let him! Never had him hunt oysters though as I never took him to the ocean. If he could have breathed under water I don't think I would have been able to get him out of it:)