According to the Chicago Park District dog park web page:

"Creating a dog friendly park in a Chicago Park is a grass-roots process. If a group of dog owners decide this type of area is needed in their local park, there are a series of steps they must follow. These dog owners have to organize themselves as an official council. Over the course of a year, this group should engage in four surveys of the proposed dog area space and also conduct at least three community meetings to acquire community support. Once this community support is granted, the dog council helps to monitor and maintain the dog friendly area and advise patrons on the specific rules and regulations. "