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Chaser: Unlocking the Genius of the Dog Who Knows a Thousand Wordsby John W Pilley
The Dog Who Knows
a Thousand Words
The twenty or so nine-year-old boys and girls squirmed and murmured in their seats as Chaser walked into their fourth grade classroom at Public School 31 in Brooklyn.
“She looks bigger on TV.”
“Shes so cute!”
The small tables the children usually sat at were pushed to the back and sides of the room, and their chairs were lined up in two curving, staggered rows, so they all had a good view of the space that had been cleared at the front of the classroom.
I let Chaser off the leash, and she went straight to my grandson, Aidan, who was sitting at one end of the first row with a giant smile plastered on his face.
Aidan had been begging us to bring Chaser to visit his class. He had told his teacher, Mrs. Tapper, about our visit to New York for several national television appearances, and most of the class had watched Chaser on Nova scienceNow a few days before demonstrating her unprecedented language skills. And here we were, about to give the class a demonstration in person.
After greeting Aidan, Chaser moved on to the other children, looking up at each one expectantly and wagging her tail. As Aidans classmates leaned down to stroke Chasers side, her tail wagged harder and her tongue lolled out of her mouth in an ecstatic canine grin.
Chaser is not an imposing dog physically. Shes normal Border collie size, about 20 inches tall at the shoulder and about 40 pounds. Her thick fluffy coat is mostly white with splotches of grey and flecks of black, except for large patches of black on the left side of her head, both sides of her torso, and her hind legs. Although she has plenty of spirit, overall she has a soft temperament. I often tell people, “Shes a lover, not a fighter.”
All the same, a few children were a little shy about touching Chaser. Any dog can be intimidating for people who arent used to them. Chaser has lots of experience with children, however. She knows that theyre the best possible candidates for her favorite activity, play. She wiggled and squirmed and wagged her tail appealingly in front of the shyer kids, and soon even the most reluctant children were grinning right back at her.
It was time to begin. We only had an hour and there was a lot to show. The principal, Mrs. Scarlato, went and stood in the back of the classroom with her camera, and Mrs. Tapper introduced my wife, Sally, our daughter (and Aidans mom) Debbie, and me to the class. Then I called Chaser to me and she lay down at my feet.
“Im Dr. Pilley,” I told the children, “and Im a scientist. Can anyone tell me what scientists do?”
One boys hand shot up, and I pointed to him. “Scientists invent things,” he said. Another offered, “They look at stars and rocks and stuff like that.” And a girl said, “They study plants and animals, too.”
I asked, “Why do scientists study things like rocks and stars and oceans and plants and animals? What are they looking for?”
Another girl said, “They want to discover things.”
“A-ha, thats it! Thats what we scientists are after, discovery! Chaser and I have been trying to discover how much human language she can learn.” I see Chaser as a co-investigator and research assistant rather than as an experimental subject. Just as shes a part of our family, shes also the other half of my research team. “I understand youve heard that Chaser knows more than a thousand words.”
Over the previous few weeks there had been headlines around the world about Chaser. It all began just before Christmas, with the e-publication of a peer-reviewed scientific article on my research with Chaser. Id written it with the help of Alliston Reid, a former student of mine at Wofford College in Spartanburg, South Carolina, where he had succeeded me as a professor of psychology.
The article, published first online and later in print by the British journal Behavioural Processes, reported that Chaser had learned and retained the proper noun names of 1022 objects over a period of three years. She had also learned to understand and distinguish the separate meanings of proper noun names and commands, and had learned at least three common nouns, or words that represent whole categories of things. Furthermore, she could learn a new word by exclusion, meaning that she could infer the relationship between a name she had never heard before and an object she had never seen before, by picking the new object out of a group of objects whose names she already knew. These are abilities that are normally seen in children when they are learning language as toddlers, and there is fierce debate among scientists as to whether animals can really do the same things.
On December 8, 2010, the day the article was published online, I received a phone call from a journalist for the British magazine The New Scientist. Two weeks later, the online edition of The New Scientist ran a story with the headline, “Border collie takes record for biggest vocabulary.” Our phone started ringing off the hook and my email inbox began filling up with messages from print, online, and broadcast media. Over the week from Christmas to New Year the Chaser story “went viral,” as Debbies husband, Jay, explained it to me.
In more than 46 languages, the headlines ran the gamut from silly to serious. The National Examiner put Chaser on the cover next to Brad Pitt and Charlie Sheen. Most of the media attention centered on Chasers knowing over a thousand words, which MSNBC noted is more than most toddlers know. There was also lots of speculation about whether Chaser was “the worlds smartest dog.”
“So far as its been documented,” I told the class, “Chaser knows more words than any other dog. In fact, she knows more words than any other animal except humans. Were going to demonstrate Chasers learning of words for you in a minute. But first I want to show you some learning that she shares with a lot of Border collies.”
I opened the plastic bin wed brought with us and showed the children what was inside: twenty of Chasers toys, mostly stuffed animals and dolls, but also balls and Frisbees. Each one had a name written on it in permanent ink, like “Bamboozel,” “Frat Rat,” “Bear,” “Croc,” “Sponge Bob,” “ABC,” “Prancer,” and “Santa Claus.” Among the rest of her toys at home there was more than one teddy bear, but the other bears had unique names with no repeats. That made it possible for Chaser to keep them straight in her head.
I put one of the toys, a foam Frisbee with “Flipflopper” written on it, down on the floor about eight feet away from Chaser. She had her head down as if she had no interest in what I was doing. Only experience told me that she was “giving an eye to the sheep and an ear to the farmer,” as Border collie trainers say. Flipflopper was one of Chasers flock of named toys, one of the 1022 surrogate sheep she has acquired in her language training. Any activity to do with Flipflopper was important to her.
With her ears down and her eyes half closed, Chaser looked like she was in a trance state, as more than one journalist has described her in these moments. But she had her legs and feet drawn under her evenly on both sides. That was the one tell-tale sign that she was ready to spring into action, as soon as I spoke the words that told her what I wanted her to do.
“Chaser, go out,” I said, using the words that sheep farmers have traditionally used to start their dogs towards some sheep.
Chaser instantly got to her feet and walked towards the foam Frisbee.
“There,” I said, and Chaser stopped still.
“Chaser, come by,” I said, and she walked around the Frisbee clockwise.
“There,” I said, and she stopped again.
“Chaser, way to me,” I said, and she walked around the Frisbee counterclockwise.
The children were murmuring with interest and inching their chairs forward.
“There,” I said, and Chaser stopped still again.
“Chaser, drop.” She dropped flat on her belly. Some of the kids started giggling.
“Chaser, crawl,” I said, and she began to crawl toward the Frisbee. More giggling from the kids.
“Chaser, one, two, three, take!” I said, my special signal to release her to rush to the toy and take it in her mouth. She began shaking the Frisbee with delight, triggering applause from the kids, and I encouraged her in that for ten or fifteen seconds. Then I said, “Chaser, bring Flipflopper. Drop Flipflopper in the bin.”
When shed dropped Flipflopper in the bin I told the class, “Thats Chasers reward. She gets to play with the toy. On a sheep farm, a Border collies reward would be moving the sheep around. Border collies have a strong herding instinct, and thats what they like to do best. Now for Chaser, each of these toys represents a sheep that she gets to herd in different ways. Like I said, she knows more than a thousand objects by name. The next closest dog, a Border collie in Germany named Rico, knew a couple of hundred words, and Rico was part of my inspiration for the scientific study Chaser and I have done. Now well demonstrate Chasers word learning for you.”
I had written the names of four of the toys in the bin on note cards, and I gave the cards to two of the boys and two of the girls.
“Dont call out whats on your card yet,” I told them. “First Ill ask Chaser to find some toys by name. And then Ill ask the four of you to ask Chaser to find the toys whose names are written on the cards.”
I dumped all the toys out of the bin in a jumble on the floor several feet away from Chaser. She again had her head down as if she had no interest in what I was doing. I came back over to her and said, “Chaser, find Sponge Bob.”
Chaser sprang to her feet and trotted over to the toys. She looked over the toys for a moment, and then spotted Sponge Bob at the bottom of the pile and pulled him out. That really excited the kids.
“Shake Sponge Bob, Chaser,” I said, to give her a moments play as reward, and then had her bring Sponge Bob over and drop him in the bin.
I asked Chaser to find and bring over nine more toys, calling for each by its unique name. With ten toys still left on the floor, but spread out a bit now by Chasers nosing and pawing among them, I asked each of the four students in turn to ask Chaser to find the toys written on the note cards.
“Chaser, find Santa Claus,” the first child said.
“Chaser, find Bamboozel,” the second child said.
“Chaser, find Mickey Mouse,” the third child said.
“Chaser, find Croc,” the fourth child said.
One by one Chaser found the toys. After shed had a chance to play with a toy for a few moments, which always delighted her, I asked her to deposit it in the bin.
Each time Chaser did something one of their classmates asked for, the class got more and more excited. It was a shame we couldnt give them all a chance to work with her. But in the time we had left, I wanted to show the kids two more aspects of Chasers language learning.
Earlier I had asked the kids how many of them had a dog at home, and about half did. When I do classroom demonstrations in places where most people live in houses with backyards, practically every kid will raise their hand.
Now I said, “Those of you who have dogs, when you tell your dog, ‘Its time to go for a walk, does your dog understand that each of those words has a separate meaning?”
They all said, “No.”
“What word do you think your dog does know?”
The kids gave various answers, but the consensus was that their dogs all knew the word “walk.”
“Well, ‘Its time to go for a walk is a pretty long sentence. How about something simpler? If you throw a ball and say, ‘Fetch ball, does your dog understand that those two words have separate meanings?”
This was a tough question, but the kids finally decided that their dogs really only understand the “fetch” part.
“Many scientists think thats all a dog can ever learn. They say that dogs dont really understand that different words have separate meanings; they just learn to associate your words and gestures with certain actions you want them to make, like ‘sit, ‘stay, or ‘fetch. Chaser and I did another experiment to test exactly that.”
I took three of Chasers toys, Bear, Croc, and Prancer, and put them on the floor.
“Okay, class, we have three toys, and we can use three different commands. We can ask Chaser to nose a toy, paw it, or take it, which means take it in her mouth. And we can mix the three commands up with the three objects in any way we like. Let me show you.”
In succession, I asked Chaser to nose, paw, and take different toys, and then I picked a couple of students to do the same.
“What do you think, class?” I asked. “If we can use different commands with different toys, does this show that Chaser understands that a word for an action means one thing and a word for an object means another thing?”
“I agree with you,” I said. I didnt add that I was waiting to see if any scientists in the field of animal learning would find fault with my experiment and cast doubt on its results. As it happened, no one did. In fact, in the three years since the Behavioural Processes paper was published, no one has rebutted any of its specific findings, although the controversy about animal learning continues unabated. Meanwhile, Chasers learning has also continued, reaching remarkable new heights that include adding many common nouns to her vocabulary, understanding sentences with three elements of grammar, and progress in imitation learning.
“I wish Chaser and I could spend longer with you,” I told the class, “but were running out of time, and theres one more thing we really want to show you. Chaser can learn the name of a new object even though shes never seen the object or heard its name before, and she can do it in one try. All the toys I brought with me are things Chaser knows the name of, so we need a new object. But we dont want Chaser to see it yet. Aidan, why dont you take Chaser behind Mrs. Tappers desk? That way we can be sure she cant see anything.”
Aidan grinned at his classmates, looked over at Mrs. Tapper to make sure she had no objection, and took Chaser behind the desk and crouched down with her. For good measure he put his hands over Chasers eyes, and I thanked him for doing that.
Then I asked the class, “Does anyone have an object we can use?”
Lots of kids raised their hands. But a girl in the second row caught my eye by waving a bright red plastic change purse.
“That looks good,” I said, taking the purse from her outstretched hand. “What are we going to call it?”
“Purse!” several kids said.
“We could do that, but Chasers heard the word purse many times, and she probably knows that
Aidans mother and grandmother and other people have purses. So she might already have an association for the word ‘purse in her mind. We want a name that will be completely new to Chaser. It could be anything, it could be just a silly sound, like ‘Woosh. Should we call this ‘Woosh?”
This sparked smiles and laughs. “Yeah, lets call it ‘Woosh,” the kids agreed.
I said, “Well put down some objects that Chaser already knows the names of, and then well add this new one. She doesnt know what it looks like, and until just now shes never heard the special name were giving it.
“Before we see if Chaser can find the new object when we ask for it by its special name, lets ask Chaser to find some familiar objects. She might come over here and take the new object just because it is new and shes curious about it. We all like to get new things to play with, dont we?”
I didnt tell the children that a well-known animal learning researcher had criticized a study of word learning by the Border collie Rico, precisely for not establishing whether the dog had “a baseline preference for novelty” when it came to learning the name of a new object. This was one of a number of criticisms by prominent researchers of the Rico study, which was published around the same time Sally and I got Chaser as a little puppy. I had carefully designed my own experiments, such as asking Chaser to find some familiar objects first, in the hope of avoiding such criticism.
At this point, I asked Aidan to go back to his seat and I called Chaser over to me. Then I said, “Chaser, find Mongrel.” Chaser found Mongrel among the toys. And then I asked her to find other familiar toys by the names shed learned for them. She found them all without a glitch, ignoring the unfamiliar object and demonstrating that she had no baseline preference for novelty. After each trial with a familiar toy, we put it back in the pile and jumbled all the toys up again.
Finally I said, “Chaser, find Woosh. Find Woosh.”
Chaser went over to the toys and looked them over carefully. She pawed them a bit, and then bent down and picked up the red plastic coin purse.
“Yes! Good girl, Chaser! Good girl! Chaser, bring Woosh. Bring Woosh.”
She brought the red purse over to me and dropped it in the bin.
The kids loved that, and they gave Chaser their biggest cheers. She responded with body wiggles and tail wags, ears up, eyes wide open, tongue lolling out of her mouth—all signs of how pleased she was to win the kids attention and affection. Then I said it was unfortunately time for us to leave and suggested they come to the front of the room and have their picture taken with Chaser. Chaos erupted, and they crowded so tightly around Chaser that she couldnt be seen. She didnt mind. She loved being petted and stroked by the children. But the chaos had to end, and Mrs. Tapper and Mrs. Scarlato good humoredly restored order and arranged the children around Chaser for a photograph.
My last words to the class were to remind them that play was Chasers reward. I told them that they should always reward their dogs for good behavior by playing with them and petting and praising them. We all learn better and faster when learning is fun.
A couple of days later, before Sally and I drove home to South Carolina with Chaser, Aidan came home from school with giant thank you cards that he and his classmates had each drawn of Chaser and signed. One little boy put himself in the picture with Chaser, giving himself a big red heart for a body and big stars for eyes. It was such an eloquent way of saying that he loved Chaser and she was a star in his eyes. A little girl drew a smiling Chaser with her toys, giving her a gold “Chaser” name tag on a pink collar that matches the pink of the insides of her ears. It was really touching to have all the childrens drawings.
Throughout the classroom demonstration, Chaser had been in her element. Finding objects, herding them, learning new objects and names, interacting with the children, in all these things Chaser was expressing her intensely social nature, a characteristic that all domestic dogs share in different ways, and her strong Border collie instincts and drives. Her unprecedented language learning rests on these two factors and on the relationship that Sally and I have built with her around them.
Together the three of us have gone on a journey of discovery we could never have anticipated. I had been retired for nine years when Chaser came into our family and reawakened my passion for discovery—really, reawakened me as a person as well as a scientist. But Chaser was not my first Border collie, and not the first dog to be my co-investigator and research assistant. Twenty years before Chaser, there was Yasha.
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