This 3-year-old dog is very big, very strong, and athletic.  His strength and calm disposition make him ideal for mobility assistance and his training in that area is underway. Zack is eager to please and easy to handle. He will make someone a faithful and loyal companion. He's great with kids and very social with other dogs. He wants to play ball all day long when not working.  His size, good looks and confidence also make him the perfect personal/family protection dog.