Big bigger Biggest! For some people, a normal dog is not enough, it has to be the XXL version! Life with big dogs also brings big adventures. How does a 92-kilo Leonberger react when he's put on a diet? And is Great Dane "Merry Christmas" finally having puppies? "Dog professional" Martin Rütter looks at the colorful everyday life of the super-sized four-legged friends and their families.