You could fool me!

This could be Ozzy but it isn't.  It's another one of his cousins.  Close cousin.
It's a Bernese Mountain dog ( Berner Sennenhund in German and Bouvier Bernois in French) which originated in the Swiss mountains and was named after the Canton of Bern. The breed was used as an all purpose farm dog for guarding property and to drive dairy cattle long distances from the farm to the alpine pastures. They make ideal pets.  Just like Ozzy.