Dog Dayz is a Boulder special event so requires a plenty of warning! September 15, 2014 starts Dog Dayz at Scott Carpenter Pool. This is the time when the City of Boulder turns into an aquatic dog park for two weeks. The pool closes for human usage and we open up the water for dogs to enjoy. The Dog Dayz event has been running strong for nearly a decade! It is a great way to spend a warm afternoon with your best friend — your dog (or dogs) will be grateful for the chance to cool off and play with others. More info on Dog Dayz right here.