No, Newfoundlands are not lazy. They are big, heavy dogs that smartly conserve their energy when they don’t have anything to do.
However, Newfoundlands’ tendency to conserve energy should not be confused with laziness. A Newfoundland dog will be up for any tasks, games, or exercise you suggest. These dogs love to be active when there is a purpose or goal.
In fact, Newfoundlands are so hardworking and dedicated to their tasks that fishermen in Newfoundland use them to haul in fishing nets and carry heavy loads, and even save drowning fishermen without any training.
With that being said, if you don’t make efforts to keep your Newfoundland busy, it will be lazy. If you want an active dog that plays a lot on its own, a Newfoundland isn’t the dog for you.