A lost animal safety device is disclosed, comprising a harness having embedded features that reduce injury to, and enable fast recovery of, lost animals. The inventive device comprises a singular or plurality of fixed, portable or mobile wireless electronic leashes to transmit and receive wireless signals linked, paired or other wised matched by frequency, phase, algorithm, code or combination thereof to a singular or a plurality of corresponding animal harness-mounted transceiver units wherein detection of proximity is accomplished and logic determines sequence of events such as sounding an alarm, delivering a warning alert, deploying an instantly human recognizable safety marker and/or deploying a run inhibiting inflatable bladder to alert the owner, motorists, Samaritans and rescuers to the instant location and plight of the animal as well as slowing the animal to aid in recovery.