Cats entered China probably more than 3,000 years ago. The earliest history books that recorded domestic cats were in the Western Han Dynasty. There were no records about cats before that, so it is speculated that they may have entered China during or before the Western Han Dynasty. Cats have been very popular with humans since ancient times. With the development and progress of society, there are more and more varieties of cats. Many people choose to keep cats as companions, because cats are easier to take care of and do not need to be taken out for walks.