Depends on the dog. And the man. And the cudgel. Kidding aside, dogs weren't bred to be gentle house pets back then. Think something closer to a domesticated wolf.
The Pinterest link to the statue submitted earlier (https://news.ycombinator.com/item?id=11049681), if it's supposed to be a depiction, makes the dog look pretty damn big by today's standards. I would not fancy my chances against it with just a cudgel... :)
