How does the author use foreshadowing in the story, There Is a Wolf in My Time Machine?

The story is loaded with foreshadowing, with Niven hinting at what is to come while avoiding saying outright what is happening. For instance, the first reference to the horse with a horn foreshadows the seeming breakdown of the time machine and the mistaken perception of where he is that Svetz will have in the wolf world. He is wrong about the unicorn being a horse, and he will prove to be wrong about why the air in his extension cage becomes poisonous to him. Another significant foreshadowing arises out of the physical changes the captured wolf undergoes. The description of its change into something manlike suggests werewolves; yet this is misdirection because the wolf is not a werewolf, just a wolf becoming like wolves in the world through which the extension cage extends. This episode indicates what happens to Svetz, who also changes to match the humans of the wolf world. It also hints at the ending, in which Wrona undergoes her own change when, like a loving dog, she insists on staying with Svetz.