Mastiffs are Boxers on steroids.
Funny you posted that because today I came down to find my petulant young boxer, Rock, had destroyed his bed and had foam pieces all over the downstairs.
How did we know it was him instead of Ruby, the older, calmer girl? Maybe it was the pieces of foam hanging from his jowls stuck to his fur......hmmmmm!!!!!
Funny enough, the scene in this video is quite normal for anyone with a larger size puppy.
TP my friend.