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.
Pain in the legs may be due to injury or inflammation of any of the structures that are found in the leg, including bones, joints, muscles, tendons, ligaments, blood vessels, nerves, and skin. Inflammation of tissues is usually the cause of pain.Pain can also radiate from other parts of the body and be felt in the leg.Back ailments can cause pain and numbness of the leg. Abdominal aorta and iliac artery aneurysms can also present with leg pain.nflammation of tissues is usually the cause of pain. Pain can also radiate from other parts of the body and be felt in the leg. Back ailments can cause pain and numbness of the leg. Abdominal aorta and iliac artery aneurysms can also present with leg pain.