This article is from the Neapolitan Mastiffs Breed FAQ, by firstname.lastname@example.org (Barry Reder).
The adult Neapolitan Mastiff can consume up to a gallon of food a day.
It is not recommended to overfeed or over supplement your dog,
especially puppies or young adults. Too much weight or proteins and
minerals can actually cause damage to your dog's tendons, ligaments
and skeletal structure.