John Pilly News Today

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.

>> reporter: john has taught chaser to tend to an extremely large, if unconventional herd, 1,000 toys. she knows the name of 1,000 of these? i find this hard to believe so i test her memory with a random sampling. find inky. she got one right. find seal. whoa! and that one, too. in fact, she got all nine right. but what about a new toy shes never seen or heard the name of? chaser has never seen darwin, hasnt heard the name darwin. were going to see if she picks out darwin by inference. find darw...