After a dog is hit by a car, internal injuries will begin to show up around 2 to 3 years later. At this time, there will be obvious congestion on the surface of the dog's skin, the dog's breathing will become rapid and weak, and it will also lie on the ground motionless. situation, this time may cause danger to the dog's life. Therefore, when a dog is hit by a car, it is best to take the dog to a pet hospital immediately to check whether it is injured.