题目

    Maybe you have a dog at home and enjoy taking it for walks and curling up with it oft the sofa. Personally, for me they re aggressive, smelly animals that need constant care and lack the independent nature and cleverness that cats have. But given the life - saving skills they sess，maybe I should give (hem a second chance.      To some a perfect pooch might be one that looks cute, is loyal and sits when it's told but that's about it — it's just a pet. But to really be man's best  friend, they need to do something  useful. Some breeds that have amazing sense of smell are