Fact: Research suggests that dogs have evolved certain muscles around their eyes to better communicate with humans (that overwhelming "sad" or "pleading" look). Why: Raising the inner eyebrows makes the eyes appear larger and more child-like, which encourages protective instincts in people. Source: https://www.pnas.org/

Fact: Several studies link dog ownership to a lower risk of cardiovascular disease and lower overall mortality. Why: Among the effects are regular exercise, reduced stress and increased social interaction. Source: https://ahajournals.org/journal/circ