Why was gulliver asked by his master to leave the land of houyhnhnms? How did he react to the orders?

Gulliver’s master had provided him a room in his house. He furnished it well and started staying there like a houyhnhnm. Considering his similarity to Yahoos, who were extremely disliked by houyhnhnms, many of them were offended by this idea of allowing Gulliver to stay in their society. Moreover, they were also aware of the disrespectful ways in which the horses were treated in Gulliver's homeland. Hence, Gulliver was called by the Master and told to leave.

Initially, Gulliver was appalled by the idea of being banished, as he had developed a sense of liking towards simplicity and perfection of the houyhnhnms society and saw his world and family in England comparable to Yahoos. Hence, he was sad when he heard the news. But later, realising the reality of the situation, that he was there only for limited time period, he built a new canoe with the help of a servant and decided to continue with his voyage.