Abstract: The invented apparatus is useful for generating a spray of repellent to ward off an attack by a person or animal. The apparatus includes a canister that contains pressurized repellent such as mace, pepper spray or tear gas. The canister is relatively small, generally four centimeters or less in its largest dimension, so that the canister can be readily concealed. The canister can include a clip that allows the canister to be attached to an article worn or carried by the user. The apparatus can further include a ring that can be worn on a digit of the user's hand, and into which the canister can be inserted. Whether used with or without the ring, the canister can be discharged to ward off an assailant.