Their instincts tell them to chase prey, guard their territory, protect their young, and defend themselves when cornered. Dogs communicate with the only tools they have - their bodies, a range of verbal sounds, and their teeth. However, something causes a dog to bite, and victims are often taken by surprise. There are ways to protect yourself. Shyness or fear, such as when a dog crouches, has his head low or tail between his legs.
Fearful dogs can be just as dangerous as aggressive ones.
An unnaturally still or unresponsive dog. Many fighting breeds have been bred for their ability to disguise aggressive intentions. Stay away from dogs that are in cars, chained or cornered. They often feel vulnerable and will fight to protect their territory. Never run past a dog.