Chaser the border collie has the largest human vocabulary of any dog, recognizing the names of more than 1,000 items. Chaser leaps in advance of the earlier record holder, another border collie named Rico, who knew 200 human words. The dog's vocabulary almost puts her on intellectual par with three-year-old human children.
As part of a three year training course at Wofford College, trained by psychologists Alliston Reid and John Pilley. Chaser was introduced to the names of 1,022 toys.
The dog still has a ways to go before he can contend with Guinness World Records breaking bird, a budgerigar named Puck, who in 1995 knew 1,728 words.