Cats can sprint 30 mph, but what about our dogs ? 

The quickest dog remains the greyhound, despite competition from the saluki, Afghan hound

Greyhounds can sprint 40–45 mph. They can maintain 35 mph for 7 kilometers. 

They're the world's quickest dog.

Greyhounds' huge hearts improve circulation

their fast-twitch muscular fiber-filled legs allow them perform rapid, forceful moves

The greyhound's flexible joints and spine allow for big strides,

Snow dog breeds and athletic hunting dogs have superior stamina and quickness.

Sled dogs like the Siberian husky may go over 100 miles each day," says Phillips. 

They trot 25–30 mph alone and 15–20 mph wh.

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