> dogs play many roles in human society and people often use them as working dogs.people use dogs to hunt, to guard.greyhounds, setters, retrievers are excellent hunters and are very popular in the usa where hunting is a sport.such breeds as collies, welsh corgis are wonderful shepherds and help to guard cows and sheep.a well-known breed of st.bernard is good at finding people in the mountains under snow.newfoundland that is a wonderful swimmer is good at rescuing people at sea.the usa police use dogs a lot.they train them to find drugs and bombs.dogs patrol streets together with policemen
