What part of the sentence is the subordinate clause
Eric worked until the boss told him to go home.

"until the boss told him to go home"

Explanation:

Eric worked until the boss told him to go home.

Also referred to as a dependent clause, a subordinate clause is one which complements a sentence's main clause.  I've underlined the main clause and italicized the subordinate clause.  You can see that "Eric worked" could stand alone as a sentence, but "until the boss told him to go home" could not.  

2b2t

explanation:

2b2t

normally working animals are domesticated and ruled by a master, a domesticator (tamer), to perform basic and important functions on a farm, for example. the value used in this context is animal labor in exchange for food. it is not so much a contrast to the story told by napoleon and the pigs, since the animals of that particular farm also performed functions on the farm through domestication. the only thing is that in this case, who rules them is a pig, also an animal, but very respected, to whom the other animals lent him submission. that's about a strong relationship of dependency between animal and owner.