Greyhounds are a type of dog. They are known for their long legs and slender bodies. Because they are tall and thin, they can run very fast. In fact, greyhounds are well known as racing dogs.
In many countries around the world, people breed greyhounds for speed. Then they make their dogs race around a track for prizes. The dogs can reach speeds over 40 miles (64 kilometers) per hour. That makes them the fastest dogs in the world. They’re even faster than racehorses!
In the first paragraph, “slender” most likely means…