Answer:
unconditioned response (UCR).
Step-by-step explanation:
Unconditioned response (UCR) -
In an organism , unconditioned response is generated from the unconditioned stimulus.
These are the cases where the organism response in a very normal and natural manner to any external or internal stimulus.
These behaviors are not taught by anyone .
Hence, from the scenario of the question, the dog's salivating was an unconditioned response (UCR) .