Answer:
1) The act or process of withdrawing, especially from something hazardous, formidable, or unpleasant.
Step-by-step explanation:
We can see by how it's used in the passage that it's used as a verb, not as a noun, so we can eliminate 2. There's no military forces here, and this dog isn't retiring, so I'd say your best bet is 1, since the dog is withdrawing/retreating from the whip.