When specifying components for a hydraulic power unit, the prime mover is sized based on torque, speed, and power requirements of the hydraulic pump. This is fairly straightforward for electric motors bec ause they generally have a starting torque that far exceeds running torque.
Great Danes live on average 8 to 10 years, but have been known to reach 12 years of age. The Great Dane is subject to two main health problems that afflict 99% if them - Dysplasia and Bloat. Great Danes cost more to look after than smaller dogs. Their shots will cost more, especially their heartworm medicine.
I have always told my puppy people to expect 10-12 years from a Golden. I believe a study has been done showing that to have been the same for a long time now. The larger the dog, the shorter the life expectancy. Toy dogs can be in excess of 15 years, while Great Danes and Irish Wolfhounds can be in the 6-8 age range.