A: I was just watching a documentary on tv about people us dogs for various purpose. It was very interesting.
B: 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.
A; 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.
B; horses are useful to people too. We use them for sports and recreation.
A: don't forget that horses are still used in many countries to pull ploughs and carts.
B: can you ride a horse?
A: yes, I can. I don't ride regularly though. How about you?
B: I can ride too. Perhaps we could go horse riding together at the weekend?
