What was the unconditioned response in Pavlov's original experiment on classical conditioning

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In Pavlov's original experiment, the unconditioned response (UCR) was the salivation elicited by meat powder. This response was considered unconditioned because it occurred naturally and automatically, without any prior learning. The meat powder was the unconditioned stimulus (UCS) that elicited the UCR of salivation. In other words, the dogs didn't have to learn to salivate in response to meat powder – it was an innate reflex.

What Was the Unconditioned Response in Pavlov's Original Experiment on Classical