I used to know some PETA activists many years ago. What a bunch of sadsacks they were: social inadequates unable to bond with humans who fixated on animals instead, anthropomorphising them in the process. If I knew the guy in the lake was one of those, I'd let the moron drown. As for the dog, I'd no more risk my life for it than I would for a hamster, stick insect, or any other lower life form. Anyone who'd do otherwise deserves a lungful of water.