It's Animal

A while before writing this, I gave my cat a few scraps of fried chicken. They were the remnants of a batch my wife made for a road trip we'd made a day before and were yet, uneaten. I settled down to watch a movie and was sitting there for a time when I realized I had to go to the bathroom. The moment I stood up, the cat meowed. The tenor of the sound said "do you have any more?" I did nothing but continue to stand and then went to the restroom. On my way, I realized what had happened. The cat had made her best request. She laid her wants on the line for my scrutiny. She knew the answer was entirely in my hands, and she asked all the same.

I have concluded from this that animals (mine, anyhow) lack what we might call a "fear of rejection". She often displays this propensity to call for "the possible" in spite of repeated rejection (to post-preface this statement, it can be assumed that her requests for people-food have been met with more rejection than approval). Why do I consider rejection to be a negative thing when even my cat doesn't? What virtue does this animal have that I do not?