Animals is probably my favorite PF album, but even I could figure at that basically it's a allegory about the workers (Sheep) ultimately overthrowing the capitalists (Dogs and Pigs).
The irony is that, at the end Waters character admits that he is himself a Dog.
"Animals" was my favorite Pink Floyd album, too, back in the day. (I had it on eight-track - that's how old I am - lol). All of Floyd's music was "anti-establishment". What Waters doesn't seem to realize is that the Dem party has set up an establishment, and we are the new anti-establishment.