Dogs understand 1022 words

Do you know that dogs can understand 1022 words? Do you think dogs can understand human language? Chaser is one pooch that certainly has the bow wow factor. In three years of intensive training this sprightly Border Collie has managed to learn an astonishing 1'22 words. So just how does she do it? 

Before watching the video, you are going to do the preparation task. 

After watching the video do the multiple choice. Remember you can read the transcript at any time.