Detailed text transcripts for TV channel - KGO - 20110210:11:25:00
Finally this half hour, we ♪ all know dogs are smart. many of you can probably regale us of stories of our brilliant pooches. >> but one top dog knows more than 1,000 words and host of nova scientists now has explained, thats nothing to wag your tail at. >> reporter: meet chaser. beloved 6-year-old border collie of psychology professor john pilly. >> good girl. he was born to live in scottish mountains. chase. tunnel, tunnel. and herd sheep.
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