If you choose to make friends with a pig, you must be prepared to live in the mud.
The kind of friends we keep affect us and sometimes we are not aware of this. The pig here represents a dirty animal that loves to wallow in the mud. This is an anglicised version of the saying: Show me, your friend, and I’ll tell you who you are.
It is said in the Scriptures that “Evil company corrupts good manners.”