Is human relationship with pets useful?

There is much disagreement over whether people should keep a close relationship with their pets or not. Some people think that too close to pets could do harm to people. Other people, however, argue that a good relationship with their pets can help them a lot. As far as I am concerned, I like to have a close relationship with pets.  

Why some people want to keep away from pets? For one thing, sometimes pets may be out of control and hurt their owners. No matter how smart a pet is, it is still an animal with wild animal features. For another, sometimes pets maybe spread diseases to people. Although I agree that there may be one or two disadvantages of pets, I insist that a good relationship with them far overweigh these disadvantages. In the first place, pets can give people companionship under some circumstances, especially old people. In many west countries, it is very popular that old people live only with their pets, because their children are very busy and do not have time to spend with them or some other reasons. At this time, their pets can company their owners 24 hours 7 days. To these old people, pets are their members of family.  

In the second place, some pets can help disable people. As we already know, trained dogs can guild blind people walking. Although pets are just animals, sometimes they can do something unexpectedly. For example, several years ago, there was a well-known news that a dog dialed ?11?to save its very sick owner.   In conclusion, I believe that keeping a close relationship with pets is good to people not only because the pets can make people feel not lonely, but also because pets can help people in a special way.