Dogs

Fill the spaces with a/an, the or zero article

People say that .... dog is .... man’s best friend. ……people and ……dogs first started living together about ten thousand years ago. Now there are fifty-three million dogs just in …… USA. …… Americans spend over two billion dollars on …… dog food every year.

Altogether there are about …… hundred and fifty breeds of dog. Many dogs work for …… humans, doing jobs such as helping …… blind, helping …… police and customs officers to find …… drugs, and even racing. ……greyhound racing is popular in many countries. …… fastest greyhounds can run as fast as sixty-five kilometres per hour.