An animal chastity device. One illustrative embodiment of the animal chastity device includes a fastening device and a barrier harness detachably fastened to the fastening device. The barrier harness includes a rear fastening strap detachably fastened to the fastening device, a barrier panel carried by the rear fastening strap and a center fastening strap extending from the barrier panel and detachably fastened to the fastening device. A bite-repelling mechanism may be provided in at least one of the fastening device and the barrier harness.