What decision is made concerning the status of wild creatures, such as rats and rabbits, in Animal Farm?

The idea of Animalism (Communism) is that all members of
society will work together for the great good of the community.  In order for this
optimistic yet unrealistic method to work is if all citizens can respect and trust one
another.  Old Major's speech is rudely interrupted by a rat who race across the barn, as
it's being chased by a dog.  The rats, therefore, represent the shady element of soceity
such as the criminals.  The existence of the rats raises a glitch in the funamental
thinking of Animalism in that not all animals can be trusted.  Still, when put to a
vote, the rats and rabbits are included as comrades probably because the optimists felt
they could be tamed.  Of course, the rats and the rabbits become the least of the
animals' worries after the revolution.