I remember growing up, we had a rescue that we knew had been abused and beaten with random items and would react exactly how you describe Oreo acting. I recall that when we would find him acting like that to something, my parents would lay whatever the object was on the floor and just walk away from it. Eventually he would approach it, sniff it, maybe paw at it, whatever. Once he realized that it would not hurt him, he was usually fine with it. I don't know if it will work with Oreo or not, but it's worth a try.