Are American Mastiffs difficult to train?

American Mastiffs are very intelligent dogs.  There is never a need to raise your voice with your American Mastiff.  They are very sensitive and respond very well to a normal, but firm and confident tone.  Positive reinforcement is the best method of training for the American Mastiff.  They can be stubborn at times and require consistency in training.  If you are a first-time large/extra-large dog owner, I firmly recommend formal training classes with your pup to help train you along with your American Mastiff.  Not only will you learn a bunch of great techniques and have the opportunity for your American Mastiff puppy to socialize with other dogs and other people in different surroundings, you will have an awesome bonding experience with your pup!  Puppies ofall breeds go through some difficult phases while growing up, and consistency in training is of the utmost importance.  I feel that proper socialization and training is even more important for large and extra-large breeds.  It might be "cute" for a 20-pound dog to greet you at the door by jumping up on you, but it certainly isn't "cute" for a 200+ pound dog to do the same.   It is never enjoyable to be around an un-trained or under-trained dog, but it is always a joy to be around a well-trained and well-mannered dog!