Boxer is respected for being a hard worker. He is loyal, ethical, and simplistic in his thinking. Boxer embraces the rebellion and becomes a loyal follower of the pigs. In Chapter 4, when the animals defend the farm against a human attack, Boxer realizes he has inadvertently killed a young stable-lad. He says it was not his intention and that he feels remorse. He adds, "I have no wish to take life, even human life." Boxer supports the rebellion but only in efforts to make the lives of the animals better. Even though he can not read and has a simplistic way of thinking about things, he does show that he is loyal to a strong moral code that goes beyond the politics of the rebellion.
Boxer's most famous phrase is "I will work harder." He is the most productive worker on the farm. When things are tough for the animals, he raises morale with his mantra, "I will work harder."
Squealer made excellent speeches on the joy of service and the dignity of labour, but the other animals found more inspiration in Boxer's strength and his never-failing cry of "I will work harder!" (Beginning of Chapter 7)
Boxer is an idealistic character. He simplistically believes that the rebellion can do no wrong because its initial program is to improve the lives of the workers/animals. He is also idealistic in terms of ethics and morality. He doesn't want to hurt anyone (including humans). His work ethic and his "ethics" are admirable to the other animals. Unfortunately, his determined belief in the rebellion prevents him from seeing the corruption the pigs gradually bring in.