To be honest, after reading it, I was confused and felt so deep. I also wanted to ask in Baidu like you did. But then, my head suddenly turned and I realized that I might have figured it out.

At the end of the novel, the hero calls the yellow dog "Pete", which I think means that he treats the dog as a human being, rather than as the heroine calls it "Baby", which makes it seem that the dog is just a dog, her pet.

And the novel is always told in the tone of a dog, so it wants to be more than just a dog.

The exact meaning, forgive my shallow knowledge haha, also can't read much of this profound writer.