A dog leash attachment system for selectively and releasably attaching a dog leash to a dog collar or harness, wherein the dog leash and the dog collar or dog harness each comprises a portion of a fastener device further comprising at least one magnetic attachment component and at least one mechanical attachment component. One portion of the fastener device is attached in fixed relation to the dog leash at a position proximal to the distal end of the dog leash. Another magnet is disclosed for use in maintaining a portion of the fastener device proximally to the collar or harness when the leash is not in use.