Nasser describes what it's like to share your life and home with the world's biggest dog! When Dave and Christie Nassar picked the runt of a litter of Great Dane puppies to be their new pet in 2006, they had no idea that 4 years later he'd be officially crowned the tallest dog ever by the Guiness Book of World Records. They also tell of their love for one another and their struggle to start a family.