It’s always nice to see dogs run with unbridled joy and wild abandon. After all, there's rarely a time when they look happier ...

The fastest human on Earth today is Usain Bolt. He set the 100-meter world record by running it in just 9.58 seconds. At his peak speed during a race, he was clocked at 44 km/h. Meanwhile ...

The world's fastest animals on earth, the speed heroes ... and they're among the fastest dogs in the world. They can hit 45 mph (72 km/h), and they've been bred for athletics, racing, and coursing ...

It's not even the fastest mammal! Here are the fastest animals on Earth. Follow Tech Insider: On Facebook More from Science Cheetahs have a reputation for speed. While the big cats may be able to ...