One reason i believe Dog parks should be built is Because owners would have a place where their dogs can be , play , and run with other dogs. Many dogs do not get the chance to run or walk with their owners. When they don't they end up feeling lonely and can have bad behavior. But with dog parks , They can not only run and play but get the be with other dogs. It doesn't just help the physically but mentally as well.
A second reason is , Dogs tend to physically and mentally benefit off dogs parks. Dogs are more likely to be frendly when they explore and meet