In case you are curious, here is the title story in full.
In my childhood, I was a fervent worshiper of the tiger: not the jaguar, the spotted "tiger" of the Amazonian tangles and the isles of vegetation that float down the Parana, but that striped, Asiatic, royal tiger, that can be faced only by a man of war, on a castle atop an elephant. I used to linger endlessly before one of the cages at the zoo; I judged vast encyclopedias and books of natural history by the splendor of their tigers. (I still remember those illustrations: I who cannot rightly recall the brow or the smile of a woman.) Childhood passed away, and the tigers and my passion for them grew old, but still they are in my dreams. At that submerged or chaotic level they keep prevailing. And so, as I sleep, some dream beguiles me, and suddenly I know I am dreaming. Then I think: This is a dream, a pure diversion of my will; and now that I have unlimited power, I am going to cause a tiger.
Oh, incompetence! Never can my dreams engender the wild beast I long for. The tiger indeed appears, but stuffed or flimsy, or with impure variations of shape, or of an implausible size, or all too fleeting, or with a touch of the dog or the bird.