In Animal Farm, what is the simplified theory of Animalism?

“Animalism” is the philosophical foundation and political
law by which the animals live. Napoleon changes the commandments over the course of the
novel. Squealer is in charge of writing these “commandments” on the side of the barn.
When the animal revolution begins, one of the tenets is “All animals are comrades.”
Animalism is a version of communism. Over time, Napoleon takes over, becomes a dictator
and the idea of communal equality among the animals eventually
fades.

Eventually, one of the commandments reads “All
animals are equal, but some are more equal than others.” Napoleon periodically orders
changes to the commandments of Animalism to suit the changes he thinks he has to make to
sustain his regime and power. So, Animalism is a philosophy and a political ideology.
Like all philosophies and political ideologies, different people (or animals) will
interpret them in different ways. For instance, democracy has manifested in many
different forms in many different countries. Orwell wrote this novel as an allegory of
the Russian Revolution. In both cases, the hope was that the implementation of communism
would lead to a better society. And in both cases, that implementation was destroyed by
the corruption of those in power. The original commandments clearly separated animals
from humans. The analog to the Russian revolution was a separation between communism and
capitalism. By the end, Napoleon and his cohorts begin to behave like humans. This
completes the destruction of the purity and equality of the
revolution.