Newfoundland dogs, like the two siblings we just watched, aren't going to beat a Greyhound in a race or probably any other dog in an agility course, but that's not their strength.

Sex with your sibling is called incest and is illegal in almost all 50 states. Sex with your sibling or other close relations, if you are a dog, is called inbreeding, and inbreeding is part of the ...

"One with a bunch of energy and the other is lazy playing," one viewer said, as others poked fun at the sibling chaos.