From the ArcaMax Publishing, Cats & Dogs Newsletter:
http://www.arcamax.com/news/catsanddogs/s-177123-536842
While the "Lab" is one of several kinds of retriever, it's the most
popular breed of dog in both the United States and the United Kingdom.
Exceptionally friendly, intelligent, energetic and good natured, Labs
are excellent companions and working dogs.
They respond well to praise and positive attention. They are also
well known as enjoying water since, historically, they were
selectively bred for retrieving in water environments as 'gun dogs'
and as companions in waterfowl hunting.