Abstract: A reflective safety harness for a quadruped animal such as a cat or a dog. The harness includes a pair of substantially identical elements that are mounted on opposite sides of the animal, each element having a light reflective surface. Each element includes a semi-flexible sheet that lies against the side of the animal's body and conforms thereto, and a planar member that projects outward and generally normal to the sheet so that it stands out from the animal's body and receives and reflects light impinging thereon. At the corners of the sheet are fastened straps which circumscribe the animal's body at the front and rear of the harness. Extending from the front strap at the top point thereof midway between the two elements is an auxiliary strap having at the distal end thereof a loop through which the dog's regular collar is passed, thereby assuring immovable attachment of the harness on the dog's body.