A dog is a clever animal. It has four legs and a tail. It has a good nose. It has keen eyes and ears. Some dogs are big and strong. Some are small and delicate. There are white dogs, black dogs. Thai dogs are useful dogs. They can guard our houses. Policemen use big American dogs to catch thieves. I have a dog, too. Its name is Toob. Every day, when we go away, Toob guards our house. No thieves can steal any objects in our house.