Dog vs. cat: New data show which pet brings you more joy
washingtonpost.com
washingtonpost.com
And the article goes into correlation vs causation, highlighting that there are likely other causes influencing the survey results including "...survey data show that dog owners, for instance, are more likely to be married and own their own homes than cat owners, both factors known to affect happiness and life satisfaction"
Got to go and walk the dog and be happy.