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.
Larger dogs live shorter life spans in general so some bigger APBT's/bullies can have shorter life spans. Small dogs like breeds under 30lbs can live for a really long time, breeds like great Dane's have life spans around 7 years. Most dogs will average 10-13 years and APBT's tend to live longer than most dogs. You can go to several sources to find breed life spans but the one I found most reliable is 13-15. Most APBT's in my house and in my dogs lineage have long life spans of 14-16 years my bigger dogs tend to have spans of 10-12. So if they live a healthy life and are smaller the chances your dog will live longer increase.