For sure some type of Mastiff as a primary breed, because of how much taller his rear end is and the line of his back, also how his legs are angled. Secondary I would guess some type of pitty breed. Despite the wrinkles I don't see any shar pei at all, Mastiff pups look wrinkly just like that when they're young. I'm thinking pit partially because of the red colour (although it could come from a Mastiff, ie French) but also the snout, nose, and the way his eyes sit reminds me of a pitty.
Check out this wrinkly corso pup: