As it turned out, the dog is not only a friend of man, butand a reliable defender. At least, according to a new study of scientists from Finland. Scientists believe that a four-legged pet can not only bring joy to the house, but also protect the hosts, say, from the flu.Photo:Getty ImagesIn order not to be unfounded, the researchers asked 400 volunteer mothers to keep a diary. In it, they had to note all the details of how the baby's health changes in the first years of life - from 9 weeks to the first year of life. And the observations exceeded all expectations. It turned out that children who have a cat or dog at home suffer from shortness of breath, cough, rhinitis or runny nose 30% less often. And dogs do not swallow bacteria, as you might think. But they simply strengthen the baby's immune system, so that the child becomes less susceptible to infections. Also interesting: