the disadvantages of keeping a pet　　many people like to keep a kind of annimal as a pet ,such as dogs,cats,birds,and so on .they put so great enthusiasm on them that some pets are treated like their... the disadvantages of keeping a pet　　many people like to keep a kind of annimal as a pet ,such as dogs,cats,birds,and so on .they put so great enthusiasm on them that some pets are treated like their...