Although Beauty just loves his life at Birtwick, he does say he misses one thing—his freedom. "For three years and a half of my life I had had all the liberty I could wish for; but now […] I must stand up in a stable night and day, except when I am wanted, and then I must be just as steady and quiet as any old horse who has worked twenty years" (6.1). Translation? Don't fence him in.
He says he's not complaining, but… maybe just a little, Beauty?
Beauty explains that young horses have a hard time keeping quiet if they're kept in a stall all day, but that John understands, and sometimes, on rare Sundays, Beauty still gets a few hours to roll in the grass.