Grapes are no good for dogs either. Bulldogs are awesome friends! Their farting is part of their charm.
Be careful with him in the heat as they are sensitive to high temps. Heat stroke is a threat so it's good to have a lot of water around(hose, kiddie pool, etc) when it's hot out in case they overheat. Most bulldogs I've seen swim like a rock. My brother has been breeding English bulldogs for many years and they are lots of fun to have around! Marvin is a great name. Enjoy!