Watch: Cheetah and dog in epic race: Who wins?
A cheetah and a dog might seem like an unlikely pair to race each other - but the San Diego Safari Park made it happen.
In an amazing video, the two race to see who is faster.
According to the Conservation Institute, the cheetah can reach speeds of up to 61mph.
It says: "The cheetah is a sprinter, not a long distance runner, but pairs agility with speed for deadly attack runs. Cheetahs are also very fast accelerators, and can ramp up their speed four times faster than human beings can.
"They can also pull to a stop extremely fast. It is interesting to note that the speed and agility of the cheetah is not matched by strength. The cheetah is fairly fragile and will lose in most fights with other predators. As a result, they will quickly surrender prey to competitors. An injured cheetah may not be able to run quickly, which can put its life in danger."
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