A Border Collie Knows 1,022 Nouns [NYTimes]
“He bought Chaser as a puppy in 2004 from a local breeder and started to train her for four to five hours a day. He would show her an object, say its name up to 40 times, then hide it and ask her to find it, while repeating the name all the time. She was taught one or two new names a day, with monthly revisions and reinforcement for any names she had forgotten.
Border collies are working dogs. They have a reputation for smartness, and they are highly motivated. They are bred to herd sheep indefatigably all day long. Absent that task, they must be given something else to do or they go stir crazy.
Chaser proved to be a diligent student. Unlike human children, she seems to love her drills and tests and is always asking for more. ‘She still demands four to five hours a day,’ Dr. Pilley said. ‘I’m 82, and I have to go to bed to get away from her.’”



