Why was Old Major so respected?

Old Major assumes the role of philosopher, creating a detailed model for a utopian society. His role is also that of visionary or prophet because, smart as he is, part of Major’s vision of the future came to him in a dream. In his roles of philosopher and visionary, Major represents the political theorist Karl Marx. Old Major is older and wiser than the other animals, a fact that mirrors history. Marx and his theories predated (and therefore influenced) the ideas of Lenin, Trotsky, and Stalin. All three men were still children at the time of Marx’s death.

"Old Major (so he was always called, though the name under which he had been exhibited was Willingdon Beauty) was so highly regarded on the farm that everyone was quite ready to lose an hour's sleep in order to hear what he had to say."

"He was twelve years old and had lately grown rather stout, but he was still a majestic-looking pig, with a wise and benevolent appearance in spite of the fact that his tushes had never been cut. "