Dog owners worldwide enjoy longer lifespans on average, and the company a canine provides makes those extra years of life more gratifying. Positive health attributes dogs afford remain a constant for young and elderly alike, including weight maintenance, reduced blood pressure, and improved cardiovascular fitness. The benefits of owning a dog are not limited to the physical. People with pets enjoy superior self-esteem, while suffering less depression due to an optimistic mindset that companionship with animals engenders. The variety of sizes, temperaments, exercise needs, and breed peculiarities make dogs as versatile as a Swiss Army knife, and thus accessible to all.