|Title||The Smartest Dog In The World|
|Owner||Dr. John W. Pilley|
Chaser is a Border Collie with the largest tested memory of any non-human animal. She can identify and retrieve 1,022 toys by name. She was taught by her owner, retired Wofford College professor and psychologist John W. Pilley, with the formal research published.
In addition to being able to recognize the names of more than one thousand toys, she recognizes common nouns such as house, tree and ball. Based on that learning, she and her owner and trainer Dr. John W. Pilley continued her training, demonstrating her ability to understand sentences with multiple elements of grammar and to learn new behaviors by imitation.
Chaser can learn new words by "inferential reasoning by exclusion", that is, inferring the name of a new object by excluding objects whose names she already knows.
Since Pilley's death, Chaser lives with her former owner's relatives, Sally and Robin Pilley as well as Deb Pilley Bianchi. They have been involved with Chaser for her whole life. They are also working on a second book about Chaser entitled "A World of Chaser".
- Betsy, a border collie known to understand over 340 words
- Rico, a border collie who was reported to understand over 200 words
- Koko, a gorilla who learned sign language
- Kanzi, a bonobo who learned language through keyboard lexigrams
- Ayumu, a chimpanzee
- Talking birds, including a budgerigar named Puck
- Alex, a grey parrot known for intelligent use of speech
- Nicholas Wade (January 27, 2011). "Sit. Stay. Parse. Good Girl!". New York Times. Retrieved 2011-01-18.
- "Smartest Dog". Popular Science. December 22, 2010. Retrieved 2010-12-27.
Psychologist John Pilley of Wofford College in Spartanburg, S.C., wanted to test if there was a limit to the amount of words a border collie could learn, so he taught Chaser the names of 1,022 toys, one by one, for three years. New Scientist reports that he got her to fetch the toy and then he repeated the name to reinforce her understanding.
- John W. Pilley; Alliston K. Reid (2011). "Border collie comprehends object names as verbal referents" (PDF). Behavioural Processes. 86: 184–195. doi:10.1016/j.beproc.2010.11.007.
- Dr. John W. Pilley & Hilary Hinzmann. Chaser: Unlocking the Genius of the Dog Who Knows 1000 Words. Mariner Books. ISBN 9780544334595.
- "Chaser the smartest dog in the world". Chaser the border collie. Retrieved November 6, 2018.