In the early '90s, Tempe's Mitchell Park was a notorious hot spot for pet owners disobeying leash laws. After confrontations between owners and regular park patrons, a separate dog run was created. Now dogs are allowed to roam free inside the fenced area, which includes benches and tables for owners and an adapted water fountain with a doggie dish for pets. Plastic bags and waste containers are provided, and the park is lighted after dark so owners can swing by after work in the evening. It's a popular place. It isn't unusual to find 20 or more dogs in the run, but somehow, aggression is kept to a minimum. Our guess? Dogs are so fascinated by the idea of actual freedom to play with other pets that they ignore their own territorial natures.