Like one who grabs a stray dog by the ears is someone who rushes into a quarrel not their own. (NIV)
He who, passing by, stops to meddle with strife that is none of his business is like one who takes a dog by the ears. (AMP)
He that passeth by, and meddleth with strife belonging not to him, is like one that taketh a dog by the ears. (KJV)