In other words, if dogs stay away from death, they’re probably for a longer life. According to research results published in 2010 by The American Naturalist, obedient and more submissive dog breeds live longer. The study compared the consumption of energy, personality, pace of growth and life expectancy of 56 breeds. Having checked such factors as size of a dog, scientists discovered that brave and agressive dog breeds tended to live fast and died young. Their growth was much faster that in case of obedient breeds which were willing to make people’s life more convenient and pleasant. They also had higher energy consumption. The results of the study suggest that by means of artificial selection with regard to dog’s personality, people get dogs which show connected features such as metabolism or longevity.

Source: www.livescience.com