They excel at water rescue/lifesaving because of their muscular build, thick double coat, webbed paws, and swimming abilities. Newfoundland dogs typically have dark brown eyes, but lighter eye colors are common for the brown or grey coated. The Newfoundland's extremely large bones give it mass, while its large musculature gives it the power it needs to take on rough ocean waves and powerful tides. These dogs have huge lung capacity for swimming extremely long distances and a thick, oily, and waterproof double coat which protects them from the chill of icy waters. These dogs have huge lung capacity for swimming extremely long distances and a thick, oily, and waterproof double coat which protects them from the chill of icy waters. The double coat makes the dog hard to groom, and also causes a lot of shedding to occur.