My friend has a dog called Jack. Every Sunday afternoon, my friend takes Jack for a long walk in the park. Jack likes the long walk very much.
A visitor comes to see my friend on Sunday afternoon. They talk and talk. Soon it is time for my friend to take Jack for his walk. But the visitor is still talking. Jack walks around the room several times and then sits down in front of the visitor and looks at him. The visitor pays no attention(没注意). He goes on talking.
Jack can’t stand(忍受). He goes out of the room arid a few minutes later, he comes back with the visitor’s hat in his month. From the story, we know that Jack is ______.