Lassie ain't got nothin' on a new 4-legged hero named Leila -- who saved a baby dolphin that beached itself in the UK earlier this month ... and it was all caught on video.
Leila's owner posted the footage online -- showing the heroic canine tending to a tiny dolphin that was stuck on some rocks last weekend at Criccieth Beach in Wales .
Turns out, man's best friend became dolphin's BFF that day -- because Leila alerted her human, who was able to push the little guy off the rocks ... and it successfully swam away!
Who's good doggy hero? You are! Yes you are!