The banner, which had a picture of a cat and a dog with a ball, was in honor of Major League Baseball's 2009 All-Star Game that was hosted by the city on July 14, 2009.
Purina has called St. Louis home for more than a century. The company plans to use the banner again if the St. Louis Cardinals reach the playoffs.
New shelter data casts doubt on whether the pet population and pet ownership are truly growing.
While the pandemic caused unprecedented suffering worldwide in 2020, the disruptions to dogs, cats and other pets adoption numbers may normalize in 2021.