You must have your dog on a leash at all times. Once your dog is no longer in your house or fenced yard, the State, City, and County require them to be leashed at all times.
It is actually a criminal offense in the City of Mesa, to allow your dog to roam free of a leash. The Homeowners Association also imposes hefty fines for allowing your dog to roam without a leash.
There are several approved leash-free dog parks here in the City of Mesa if Fido needs a good run. To report a violation, please contact Heywood Management or the City of Mesa Animal Control Department.
Animal Control, City of Mesa: All dogs must be leashed and kept under control when not contained in a fenced yard or inside of your home. It is also unsafe, as your dog could be hit by a car, become lost or stolen, or get in a fight with another dog. Allowing your dog to run at large is a class 1 misdemeanor under the Mesa City Code.