In Animal Farm, explain the deeper meaning of "All animals are equal but some animals are more equal than others."

This commandment appears that the end of the novel.  It is
at a point where there is a definite hierarchy in the animal life on the farm.  Pigs
exist at the top of this structure, with dogs next, and then all the other animals. The
challenge, of course, is that one of the principles of Animalism, the guiding philosophy
of Animal Farm, is that "all animals are equal."  Led by Squealer, the pigs are masters
at being able to rewrite and reinterpret the commandments of the farm to ensure their
benefit and control.  In this, Squealer modifies this commandment to read that while
there is general equality, some animals are "more equal than others."  The other
interesting element about this commandment is that all the other commandments that
started Animalism are now gone.  Only this remains as a testament to the control that
the pigs have now and for the foreseeable future of the farm.  Given how most of the
animals on the farm are illiterate or so obedient to the system that they would never
question it, the commandment stands as an example of both the lengths of the pigs' power
and how their rule is an unquestioned one.  Other commandments have been rewritten in
the book such as killing other animals or drinking alcohol.  Yet, it is this one that
speaks to both how far the revolution has come and how little has changed as a result of
it. The fact it is the only one standing of all reflects what the Status Quo wants and
what it gets.  This particular commandment embodies such a reality on Animal
Farm.