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The World’s Smartest Dog

Remembering Chaser, the border collie who learned more than 1,000 words.

Publish Date: Topic: NatureNatureNova

Chaser, known to some as “the world’s smartest dog,” died on Tuesday, July 23, 2019 at the age of 15. The late John Pilley, formerly a psychologist at Wofford College, trained Chaser to tend a “herd” made up of more than 1,000 toys and remember the name of each item in the pile. In 2009, NOVA visited Chaser to test her vocabulary.

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Major funding for NOVA is provided by the David H. Koch Fund for Science, the NOVA Science Trust, the Corporation for Public Broadcasting, and PBS viewers.