Pavlov classically conditioned a dog to salivate at the sound of a tone. He then repeatedly paired the tone with another stimulus, a bell. Later, when he rang the bell the dog salivated, even though the bell had never been paired with food. This example illustrates higher order conditioning (second-order conditioning).

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This statement is true. Pavlov's experiment with the dog and the bell demonstrates higher order conditioning, as the dog learned to associate the bell (a neutral stimulus) with the tone (a conditioned stimulus that had been previously paired with food).

Pavlov Classically Conditioned a Dog to Salivate at the Sound