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.
Causes of Leg Pain Video. Many conditions can cause leg pain and foot pain. Commonly, the main cause of the symptoms has its origin in the lower back, which is where the nerves branch out from the spine to provide function to the muscles in the leg, ankle, and foot. See Getting an Accurate Back Pain Diagnosis