Dogs of different sizes also run at different speeds. The average running speed of small dogs is 15-25 kilometers per hour, which is 4-7 meters per second. It takes about 20 seconds to cover 100 meters, while medium-sized dogs The average running speed is 30-40 kilometers per hour, which is 11-13 meters per second. It takes about 9-12 seconds to run 100 meters. Large dogs are even more incredible. The average running speed is generally more than 40 kilometers per hour, which means they can run for at least 9 seconds per second. At normal running speeds, large dogs have already reached the peak of human sprint records.