More: This pic was snapped after Mac was doing his favorite thing...running around with his best friend, Gus. Gus lives across the street and anytime they’re off leash, they immediately run to one another’s house. When we walk by Gus’ house, he gets so sad if Gus can’t play. Mac is also just super chill, loveable and socialable. He can be seen on Instagram at mac_mercer_the_doggy_ and on TikTok @mack_and_mac (where my daughter sings songs alongside Mac)