Click here to learn more.
Vetstreet. All rights reserved.
Vetstreet does not provide medical advice, diagnosis, or treatment. See Additional Information ›
Chaser: Unlocking the Genius of the Dog Who Knows a Thousand Words is about psychologist John Pilley, his Border Collie, Chaser, and a retirement project that broke new ground in the field of animal cognition. It's also an inspiring story about a man whose curiosity has kept him going well into his 70s.
Teaching a dog a thousand words is obviously a lot of work, but what was maybe even harder was to convince fellow scientists that a dog can understand even one. And if your dog always comes running when you say "cookie," you may wonder, what's wrong with those scientists? Partly it's that there's a long history to fight.
"A common belief that started with Descartes centuries back is that lower animals cannot reason. They're just machines with blood," Pilley says. "That view continues to persist among linguistic scholars who are not aware of the research that's going on with animal psychologists."
But to be fair, scientists are cautious because people have been fooled before. The animal in one famous case has been immortalized in the scientific lexicon: Researchers talk about needing to avoid the "Clever Hans" effect.
Clever Hans was an early 20th-century horse whose trainer believed he could do arithmetic — until a cleverer observer proved that Hans was actually just reading the trainer's body language. The horse, who answered by tapping his foot, had learned to stop when the trainer unconsciously relaxed at the correct number of taps.
Animals are good at picking up on those kinds of clues, so experiments have to carefully exclude them: Does your dog always get a cookie when you're standing in front of that particular cabinet? When you use a certain tone of voice?
So Pilley had to prove, for instance, that Chaser could fetch a toy that he couldn't see, so he couldn't accidentally clue her in by looking at the right object. It also wasn't enough that she understood a word when he spoke — she had to respond correctly to other people, something many of our dogs do not do with words and commands that they seem to know.
What made it even harder to convince the scientific community was the kinds of words Pilley taught her. Chaser knows not just proper nouns — say, "bear" for a particular toy — but common nouns as well, like "toy."
"Learning a proper noun is really nothing more than a label for the object," Pilley says. "But when you learn a common noun, you've learned a concept."
Toys like a ball, a rope, a Frisbee and a stuffed bear don't all have a physical quality in common — what defines them is the abstract idea that they're something you play with. Scientists once thought that concepts like this were unique to humans. And, in fact, even human children don't realize at first ... that one word like "toy" can refer to many different objects. But Pilley's work with Chaser has shown that a dog can understand this.
Like this article? Have a point of view to share? Let us know!
Take our breed quiz to find your next pet.
Get all the best pet news and information sent right to your inbox!
Thank you for subscribing!
When fans heard that the singer visited a
cat café and loved on a cat named Larry,
they lined up at Catfe to…
For the most part, you don't need to worry
if your kitty doesn't make this common
warning sound. Our vet explains why.
A people-loving dog who hails from Italy,
the Bracco Italiano is usually happiest
when he's with his family or out…
Do cats follow us to get our attention, or
could it be a sign of love? Our expert
shares her top reasons for this…
Parasites are no fun for dogs. Learn how
to protect your canine from heartworms,
hookworms, whipworms and more.
Check out our collection of more than 250 videos about pet training, animal behavior, dog and cat breeds and more.
Wonder which dog or cat best fits your lifestyle? Our new tool will narrow down more than 300 breeds for you.
Visit HealthyPet magazine for interviews with pet-loving celebrities, health advice from our experts, training tips and…
If the video doesn't start playing momentarily,
please install the latest version of Flash.
Thank you for subscribing.