Semi-feral dogs perhaps. In many parts of the world one must be cautious about the street dogs, especially if they pack up as they can be unpredictable and quite dangerous to individual humans.
yup, specially around places with a lot of trash, which happen to be anywhere in developing countries' cities, where dogs gather to find food. Very very dangerous. Even if you survive the encounter (unlikely, specially at night), you'll usually need a dozen shots to prevent a serious infection.