To be exact, Chaser could recognize 1,022 individual nouns. The black and white border collie, who made international headlines as "the world's smartest dog," has died. She was 15. Chaser made ...

The hammer fell for Elan Valley Sally, a black-and-white border collie owned by David Evans, from Brecon in Wales. The average price for a working dog is round £2,000 but the 19-month old fetched ...