In a very unusual story, a black lab was filmed attacking a deer. The dog was off leash with its owner in the 2,800 acre Rock Creek area of Washington D.C. As you can see in the video, the dog is chasing and attacking the deer on land and through water. One other dog is seen for a short period of time but eventually settles down. The owner finally gets a chance to grab the dog and end the attack. Warning: This video can be disturbing for some viewers.