It's critical to understand your Neo puppy's physical limitations; exercise him in a controlled manner so his bones and joints don't undergo too much stress during the formative period.

This means short periods of free running and play and short walks on leash only. Stairs are another hazard for the Neo puppy. He's clumsy and can easily fall and hurt himself. Carry him up and down the stairs for as long as possible, and try to restrain him from running on them.

Avoid roughhousing or wrestling. You never want your adult Neo to think it's okay to play rough with you. It might have been cute when he was a puppy, but it can be dangerous once he's full-grown.

Neapolitan Mastiffs don't make great jogging companions and are usually happiest when curled up on the couch. An adult Neo will benefit from a couple of short to moderate daily walks, however. He's sensitive to heat and humidity, so schedule walks for cool mornings and evenings, and be sure he always has a cool place to rest and plenty of fresh water.

If you have a pool or spa, restrict your Neo's access to it unless you're there to supervise. This is a top-heavy dog who doesn't swim well and has difficulty keeping his head above water.

Start training your Neo as soon as you bring him home, while he's still at a manageable size. Enroll in a puppy socialization class to accustom him to being around other dogs and people. This is extremely important for the Neapolitan Mastiff, who can be aggressive toward other dogs and people if he isn't taught manners.

In addition to puppy kindergarten and regular obedience class, take your Neo to parks, outdoor shopping malls, and other places where he can learn to meet people and become accustomed to new experiences, sights, and sounds.

The Neo is headstrong and needs a confident trainer. Use positive reinforcement techniques, never physical punishment, but be firm and consistent in what you ask of him.

Think beyond puppyhood. If you don't want your Neo on the furniture when he weighs 200 pounds, don't let him on it when he only weighs 20 pounds. Once a habit is established, it will be difficult to break.

Housetraining shouldn't be a problem as long as you make it a positive experience and provide your pup with a regular potty schedule and plenty of opportunities to go outside. Crate training is a wonderful tool for housetraining and keeping your young puppy from chewing things he shouldn't.

The Neapolitan Mastiff needs a firm hand when training, but he also needs love and patience. When he's trained, you'll find that he's a wonderful, caring, and loyal companion who will gladly risk his life to defend yours.

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