Abstract: A locking system for pets. The system includes a locking leash assembly comprising a leash with a pet-securing region and a handle region. The handle region is adapted to be held by a user. The pet-securing region includes a lock assembly having a locked configuration and an unlocked configuration. In the locked configuration the lock assembly is adapted to secure together spaced-apart portions of the pet-securing region, thus defining a closed perimeter. The closed perimeter is sized to extend around a portion of a pet and configured to prevent removal of the leash from the pet. The lock assembly in the unlocked configuration is adapted to permit the release of the spaced-apart portions of the pet-securing region. In some embodiments, the leash includes a coupling structure adapted to be removably interlocked to a pet collar.