In this article, the author examines how Diogenes of Sinope and Plato employed the analogy of the dog in order to illustrate two very different conceptions of the philosopher. Although in both cases the analogy of the dog is used to exemplify and explain certain moral or psychological characteristics of the philosopher, the author argues that the differences between Diogenes’ and Plato’s usages of the analogy are both more essential and more philosophically significant. Thus, against those scholars who claim that (...) there is a tight link between the Cynic’s and Plato’s analogy, the author demonstrates that these two versions of the paradigm should be understood independently from one another. The article is accordingly devoted to contrasting Diogenes’ and Plato’s respective usages of the analogy of the dog in order to bring out the profound rift separating their rival conceptions of the philosopher: whereas Plato’s guardian assumes the responsibility of protecting the just society and its institutions, Diogenes’ philosopher, by contrast, defends a marginal way of living that shuns institutions altogether. (shrink)