I have a have a German Shepherd/Boxer mix and he's 13 years old. I take him on a walk twice a day to keep those old joints feeling prime and obviously so he can just get out of the apartment. Anyways we're walking along and just when we get to the second half of our walk him and I both notice a something small and black crouching in a shadow in the middle of the street. I couldn't make out what it was but at first thought it was a cat. No biggie if it was we'd just walk on by and it would mind its business. But as we started getting closer it starts moving toward us and I knew there's not a stray cat brave enough to move on two big animals out in the street like that. It just kept on coming along and I still could tell what it was and couldn't make out the shape completely because it was so dark. But I wasn't going to turn around and I wasn't about to pull out my pistol for something that size. It was literally just cat size but the way it moved freaked me the hell out. So as we get really close I draw my knife and loosen my grip on the leash so the old man could handle his business if he had too. As I got about 10 feet away from the thing.................................................................IT WAS A BLACK PLASTIC BAG.