but john pilley didn't stop with the names of toys. >> pilley: nose k.g. nose k.g. nose it.it. good girl. >> cooper: he's taught chaser that nouns and verbs have different meanings... >> pilley: paw it. paw it. >> cooper: ...and can be combined in a variety of ways. >> pilley: chase, take wheel. do it, girl, do it. okay. out. out. chase, take k.g. do it. good girl. good girl. >> cooper: so she's actually understanding the difference between "take," "paw," putting her paw on something, and putting her nose on something? >> pilley: right. and that's what we are demonstrating. >> cooper: all this learning has been possible, pilley says, because of a breakthrough chaser had when she was just a puppy. at a certain point, she realized that objects have names? >> pilley: right. it was an insight that came to her. >> cooper: how could you tell that she'd suddenly had that insight? >> pilley: well, it was in the fifth month and she'd learned about 40 names. and the time necessary to work with her kept getting shorter and shorter. >> cooper: she was starting to learn words faster and