If anything this story had not determined human anguish and suffering but simple human nature, meaning apes and what we used to be as people, as the imagery of animalistic tendancies are produced through the dog and the man having this heartfelt moment, and yet the man dosent do anything about it as it is seen as a way of affection between the two *animals* as a regular 'person' per say would not allow for such behaviour.
But it is our very nature, as animals, to anguish and suffer. Even in our highest moments of joy there are valleys of despair. And our despair is what makes us human and allows us to grow. Had Jerry not suffered the immense, "hellish" despair of running out of toilet tissue, he would never have experienced the almost "heavenly" moment with his loyal companion. So it goes.