I read a previous post concerning cats and leash law, unfortunately Mesa does not have a leash law for cats. However you may get a cat trap from Mesa Police Humane Department for a small deposit which will be returned when you bring the trap back. If you are successful in catching the cat Mesa PD Humane Officer will come and take the cat away. There is however a leash law for dogs in the City of Mesa. I for one don't appreciate one of my neighbors on Crescent who takes his dog for an evening walk (without a leash) and allows it to use my front lawn as his toilet. Mesa PD Humane will also respond for dogs running loose, barking dogs and other animal problems.