Though relatively mellow, this dog needs regular activity. He's no long-distance runner, but he's a great swimmer.

You'll need to take special care if you're raising a Newfoundland puppy. Like other giant breeds, the Newfoundland grows very rapidly between the age of four and seven months, making him susceptible to bone disorders. As a big dog, he ages more quickly than small dogs too.

Don't let your Newfoundland puppy run and play on very hard surfaces such as pavement or pull a cart until he's at least two years old and his joints are fully formed. Normal play on grass is fine, as is puppy agility, with its one-inch jumps. Swimming is an ideal form of exercise for a Newfoundland puppy because he works his muscles without the danger of injuring his joints.

Training should begin the day you bring your Newfoundland puppy home. He is generally eager to please so training is fairly easy. Leash training is a must with the Newfoundland, especially because he's going to weigh more than 100 pounds when he's full grown. Puppy kindergarten and obedience classes are recommended.

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