Which response by dogs in Pavlov's laboratory triggered Pavlov's interest in conditioning

Question

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Pavlov became interested in conditioning when he observed that dogs started to salivate (conditioned response) right before food was placed in their mouths (conditioned stimulus). This response was not naturally elicited by the food, but rather learned through association with a new stimulus (such as a bell) that was consistently presented before the food.

Which Response by Dogs in Pavlov's Laboratory Triggered Pavlov's Interest