This is not the turth about this dog . Look at the offsprings and you will see no traits of a labrador or napolitan mastiff.  AB community should stop listening to rumers. If we cherish rumers we can not talk about a breed since every one says something about other one.  Dave Putnam says in his great book The Working American Bulldog. Never ask a breeder to another breeder :)

Taken from the interview with David Farnetti by Tim Phaneuf...

"Champagne was a dog that James had bought at a dog fight, she was a black dog, no one knew the true breeding of her, one rumor was that she was half Pit Bull, half Labrador Retriever. I saw her and I would say she looked to be half Pit Bull and half Neapolitan Mastiff. Champagne was a very nasty, aggressive dog."