Found this article on the aol.com
What a GREAT story! Not about a lab but still wonderful... You have to read the whole article as it has a surprise wonderful twist! Enjoy!

http://www.pawnation.com/2009/08/11/lost-and-found-dog-saves-life-of-boy-with-down-syndrome/?icid=main|main|dl1|link3|http%3A%2F%2Fwww.pawnation.com%2F2009%2F08%2F11%2Flost-and-found-dog-saves-life-of-boy-with-down-syndrome%2F