I was just watching a documentary on TV about how people use dogs for various purpose . It was very interesting .   I love dogs . They have been used as guards for centuries . Nowadays , they are often used to find illegal drugs and bombs by the police and customs officers .   The documentary also pointed out that they are used by shepherds to round up sheep and by rescue workers to find people trapped under rubble or snow .   Horses are useful to people too . We use them for sports and recreation .   Don ’ t forget that horses are still used in many countries to pull ploughs and carts .   Can you ride a horse ?   Yes , I can . I don ’ t ride regularly though . How about you ? 