The American Kennel Club (AKC) standard colors of the Newfoundland dogs are: black, brown, gray, beige and Landseer (white dog with black markings) Other colors are not rare, and not recommended because of breeding double recessive genes; The Kennel Club (KC) permits only black, grey, brown, and landseer; the Canadian Kennel Club (CKC) permits only black and landseer. Contrary to popular belief The Landseer is named after the artist Sir Edwin Henry Landseer, who featured them in many of his paintings. AKC, CKC, and KC all treat Landseer as part of the breed. Fédération Cynologique Internationale (FCI) consider the ECT Landseer to be a separate breed. It is a taller, more narrow white dog with black markings not bred with a Newfoundland.
The Newfoundland's extremely large bones give it mass, while its large musculature gives it the power it needs to take on rough ocean waves and powerful tides. These dogs have great lung capacity for swimming extremely long distances, and a thick, oily and waterproof double coat which protects them from the chill of icy waters. The droopy lips and jowls make the dog drool. In the water, the dog's massive webbed paws give it maximum propulsion. The swimming stroke is not an ordinary dog paddle. Unlike other dogs, the Newfoundland moves its limbs in a down-and-out motion, which can be seen as a modified breaststroke. This gives it more power with every stroke.
The Newfoundland dog is legendary for its calm and docile nature and its strength. They are highly loyal and make ideal working dogs. It is for this reason that this breed is known as "the gentle giant". International kennel clubs generally describe the breed as having a sweet temper.It typically has a deep bark, and is easy to train if started young. It is wonderfully good with children, but because of their size at a very young age, small children could get accidentally leaned on and knocked down. The breed was memorialized in "Nana," the beloved dog guardian in Peter Pan. The Newfoundland in general is good with other animals, but their size can create problems if not trained.
Data refer : http://en.wikipedia.org/wiki/Newfoundland_(dog)