"Guys like us, that work on ranches, are the loneliest guys in the world."
" I heard him, Lennie. I'll ask him."
"A brown and white one,"
"No, I couldn' do that. I had 'I'm too long."
George telling Lennie this from the start somewhat portrays the fact that it is hard for guys who work on ranches to get out of that work field and do whatever they want to do. They just travel by themselves, making them feel lonely.
"They come, an' they quit an' go on; an' every damn one of 'em's got a little piece of land in his head. An' never a God damn one of 'em gets it.
Here, George and Lennie are still hopeful about their dream and getting everything they want in life. This puppy for Lennie is a big deal, and a step in the right direction, in relation to their dream.
"He usta like to hear about it so much I got to thinking maybe we would."
This scene played on the idea "if you love something, let it go." I feel like this was foreshadowing what was to come of George letting go of their dream because they knew it was that was best for them in their situation.
"Sure, right now. I gotta. We gotta."
Lennie, Candy, and Crooks are in Crooks' stable barn and they explain their dream to him. Crooks puts them down by saying that he has seen multiple guys have the same thing in their head, but they never reach their goals. This obviously can be discouraging to both Lennie and Candy.
George finally admits that he never really believed in the dream. He was more pretending to believe in it for Lennie's sake. Candy is let down as well when George says that it is never going to happen.
Even though George knows they would never achieve their dream, he still talks to Lennie about it in hopes that Lennie will die happy if he was thinking about the dream and that it was becoming a reality.