We were minding our own business walking past the park near our house. There was something on the sidewalk the way we were going. Finley, our 80 pound 18 month old black lab, started with a low growl and as we approached, then he started barking and threatening. By the time we were 50 feet away, Fin as really agitated, growling, barking, and had hair standing up on his back. He was saving me from this thing on the sidewalk. He's really tough.