For instance, dogs can figure out one treat plus one treat equals two treats. In an experiment, a dog watches as a researcher first puts one treat and then another behind a screen. Then, the researcher removes one treat when the dog is not watching. If the dog can add, it should expect to see two treats when the screen is lifted. When it sees only one treat, the dog is surprised. Researchers say the length of time the dog stares at the single treat indicates the dog knows one treat is
For instance, dogs can figure out one treat plus one treat equals two treats. In an experiment, a dog watches as a researcher first puts one treat and then another behind a screen. Then, the researcher removes one treat when the dog is not watching. If the dog can add, it should expect to see two treats when the screen is lifted. When it sees only one treat, the dog is surprised. Researchers say the length of time the dog stares at the single treat indicates the dog knows one treat is