It all started on a Wednesday afternoon in July 2014. Goalkeeper Stefan Frei, who was in his first season with the Sounders, tweeted a photo of his two Shar Peis - Cloi and Nala - with the fun caption "#WrinkleWednesdays :-)"... and the rest is history. By the end of the year, Frei was tweeting a photo with the caption #WrinkleWednesdays every single week.
Over 250 tweets and nearly four years later, #WrinkleWednesday has become a cherished weekly tradition. Let's take a look at some of the best ones yet: