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Trained by Dr. John Pilley in a memory study, Chaser would learn individual nouns had specific names. She could also learn new objects through the process of Inferential Reasoning By Exclusion (AKA the Process of Elimination). This means if she were shown one new toy surrounded by toys she already recognized and knew the names of, someone could ask for "[new toy name]" and Chaser could determine "[new toy name]" must be the toy she didn't recognize. She was praised as The World's Smartest Dog, Dr. Pilley wrote a book about her called Chaser if you would like to learn more about this amazing dog!