Chaser, the border collie, owned by retired psychiatrist John Pilley, has died at the age of 15.
Chaser is best known as the 'world's smartest dog.' Pilley became Chaser's furry-day in 2004 and taught her to respond to more than 1,220 nouns. Pilley used 800 cloth animal toys, 116 balls, and 26 frisbees in the four to five hours a day he trained her.
The Pilley's announced Chaser's death on Facebook.
Pilley died last year, and Chaser has been living with his wife and daughter in Spartanburg, South Carolina.
"What we would really like people to understand about Chaser is that she is not unique," one of Pilley's daughters said in an interview with the New York Times. "It’s the way she was taught that is unique. We believed that my father tapped into something that was very simple: he taught Chaser a concept which he believed worked infinitely greater than learning a hundred behaviours."