The Newfoundland is built for cold water and it suffers in heat more than almost any breed. A heavy oily coat, a large body and a lot of mass make heat dissipation slow. Summer walks move to early morning and late evening, shade and water need to be available, and a hot car is out of the question even briefly.
It is, in exchange, one of the great swimming breeds — webbed feet, a water-resistant coat and genuine lifesaving instinct. Access to safe water is close to a gift for this dog.
The Akita is more heat-tolerant than it looks, because a double coat insulates in both directions, though it too should be walked at the cool ends of the day in summer.
On money the Newfoundland runs $150–$310 a month and $2,200–$4,200 in the first year against $110–$240 and $1,700–$3,200. Food, weight-dosed medication, anaesthesia and boarding all scale with size, and cardiac screening adds a line the Akita does not have.
Lifespan is 9 to 10 years against 10 to 13, which is the hardest number on this page.