The American Mastiff is a breed of dog that was created more than 20 years ago. This dog was created as an attempt to cut down on hip problems and drooling that was associated with various mastiff dogs. This was done by Fredericka Wagner. This breed of dog looks very similar to the English mastiff.This dog was intended to be a family dog rather than a show dog. They are very calm and gentle dogs and they are also very good with children. Just to help things along, you should take your puppy to meet as many people as possible. This helps to socialize the dog so that he/she will feel comfortable around people.