Are you a dog person？Maybe you have one at home and enjoy taking it for walks and lying with it on the sofa. For me，dogs are dangerous，smelly animals.But thinking about the life﹣saving skills they have，maybe I should give them a second chance.
But after all，they are just pets.If they want to be man's real friends，they need to do something useful.Some dogs with an amazing sense of smell are trained as sniffer dogs（嗅探犬）.
There are some guide dogs and hearing dogs providing life service for their owners.They can sound the alarm when their owner has a sudden sign of illness.
It's also possible to train dogs to notice changes in blood glucose levels（血糖水平） of people with Type I diabetes（糖尿病1型）.One sick man with such a dog told the BBC， "In the three and a half years，we've been together，he has probably saved my life 3，500 times.
Saving a life for a dog biscuit （饼干） seems a small price to pay，so maybe I should have better opinions of our four﹣legged friends.
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A.To be honest，I'm that kind of person. B.There are also trained dogs providing help in hospitals and old people's homes. C.A perfect dog usually looks cute and listens to its owner. D.They appear at airports or work with the police out on the streets. E.To be honest，I'm not that kind of person. F.And actually，he does it all for a dog biscuit. G.Dogs are always friendly to people and never leave their owners. |
