Unit 18, Man's Best Friend. Why are dogs often called man's best friend? Probably because dogs have many of the qualities we want in our human companions. They are loyal, friendly, never argue, and are always glad to see us. This is one reason why we have dogs and other pets. Sometimes, we might even prefer the company of animals to that of fellow human beings. Pets provide us with many other benefits as well. Studies have shown that having a pet nearby lowers the blood pressure of elderly people and raises their spirits. One study in Britain showed that people with pets recovered more quickly from heart attacks than those who didn't have a pet. The study also found that pet owners suffered from fewer common ailments, such as colds, headaches, and fevers, than people who don't own pets. Pets help children to learn responsibility. By learning to take care of their pets, children learn how to take care of themselves and other people. Walking dogs each day gives children regular exercise. Pets can also help keep us safe. Dogs, for example, guard our homes and scare away burglars. Guide dogs help blind people see when they need to go outside. Cats catch mice and rats in our houses. Finally, pets teach us compassion. They give us a chance to show our love to other living creatures. If we can love our pets, it becomes easier to love each other. And that might be the most important benefit of all.