FREE Smoothie King Frozen Yogurt for Your Dog (Today) Posted On July 31, 2019 Smoothie King is offering a FREE Pup-Sized Bark Blend for furry friend Today! National Mutt Day is July 31st! Let your furry friend tag along to your nearest Smoothie King for a treat.WHAT IS A BARK BLEND? A Bark Blend is a scoop of vanilla frozen yogurt in a pup-sized cup