A lead system for domesticated animals has a lock capable of securing the collar and the handle ends to prevent theft of the animal. The lead system has a leash having a handle at one end and a collar at the opposing end. The lead system may have a first lock at the collar end and a second lock at the handle end which are separately activated for fastening the handle to the leash at one end of the leash and the collar to the leash at the other end for securing an animal to an immovable object. Alternatively, the lead system may have a lock capable of simultaneously securing the collar and handle ends. The lead system may also allow for adjustment of the circumference of the collar and the handle through the use of levers, with the lock(s) capable of also securing the levers.