Large Breed Longevity. The average lifespan of all dogs -- both small and large -- is 12.8 years, reports pets.ca, a Canadian pet information provider. Some larger dogs tend not to live that long, and data varies considerably by breed.
Aching Legs. Aching Legs and Feet. Injury is the most common cause of leg pain (aching legs). However, even a simple back pain can cause your legs to ache depending on the degree of pain. Usually, elders and diabetics and people with poor circulation are the ones who experience leg pain especially at night.
Leg pain can be due to a dreadful and terrible involuntary muscular contraction, tiredness of muscles, excess walking, exercises, nervous strain and lump formation because of blood clotting, improper blood circulation in the knees, hips, and foot causes leg pain.