A dog scaled a 6' fence and was acting fearful aggressive towards police officers. The officers had already entered the property and my guess is the dog was overwhelmed and overstimulated when he reacted. Partial video shows a very frightened dog, not a dog about to go on a rampage (not saying he isn't dangerous, by any means).
Interestingly, the officers who fired at the charging dog took two different tactics. One chose to fire a bean bag at the dog while the other fired a bullet. The bean bag, which is supposed to be a pretty painful deterrent, hit the dog in the head, the bullet in the leg. Animal control was able to come in and catch pole the dog.