Tolstoy accomplishes this by using the language of horse racing and domination. He writes that Vronsky's horse Frou-Frou "was drawing on her last reserve," but that Vronsky believes she has "more than enough for the last five hundred yards" (199). Because Vronsky pushes Frou-Frou too hard, he ends up having "broken her back" (199). As the reader progresses further into the novel, it becomes clear that this language of horse racing and domination is equally applicable to Anna's situation. In describing Anna's observation of the race, Tolstoy draws attention to how Anna "watched [Vronsky] going up to his horse and mounting her," very forceful language.
Though less explicit, Karenin ultimately decides to treat Anna like Vronsky treats his horse - as an object. Tolstoy describes how Karenin "became convinced that there was only one solution [to Anna's infidelity]: to keep her with him, concealing what had happened from society, and taking all possible measures to stop their affair and above all ... to punish her" - to push Anna to the brink (282). This language of horse racing and domination ominously suggests that as the novel continues to unfold, Anna is going to be pushed to draw on her last reserve. All the while, this language increases the reader's sympathy for Anna's situation, even though she is the guilty party.