Watch CBS News

Preview: The Smartest Dog in the World

Name: Preview: The Smartest Dog in the World
Uploaded: 2015-09-18T12:05:00-0400
Duration: 37 s
Description: Anderson Cooper meets Chaser, a dog who can identify over a thousand toys, and the scientists who are studying the brain of man's best friend. Watch Cooper's report on Sunday, September 20 at 7 p.m. ET/PT.

Anderson Cooper meets Chaser, a dog who can identify over a thousand toys, and the scientists who are studying the brain of man's best friend. Watch Cooper's report on Sunday, September 20 at 7 p.m. ET/PT.