How does Gulliver change in Part 4?

In the country of the Houyhnhnms, Gulliver meets the species that is the most skeptical of him-and for good reason. Gulliver must do everything he can to separate himself from the Yahoos, a very different situation from his distinct positions in Lilliput and Brobdingnag. In order to accomplish this, Gulliver does small things daily like using his best manners, eating with a knife and fork, keeping his clothes on, and being as clean as possible. He shows that he can use language, can reason well, and can be prudent and mannerly.