iro ▁ ▁Rod r igo ▁Murray ▁as ▁Gustav o ▁ ▁Gustav o ▁S ánchez ▁Par ra ▁as ▁J aro cho ▁ ▁Th emes ▁ ▁D ogs ▁and ▁dis loy alty ▁ ▁Each ▁of ▁the ▁three ▁tales ▁is ▁a ▁reflection ▁on ▁the ▁cruel ty ▁of ▁humans ▁towards ▁both ▁animals ▁and ▁other ▁humans , ▁showing ▁how ▁humans ▁may ▁live ▁dark ▁or ▁even ▁hide ous ▁lives . ▁But ▁the ▁film ' s ▁theme ▁is ▁loyal ty , ▁as ▁symbol ized ▁by ▁the ▁dog , ▁" man ' s ▁best ▁friend ". ▁D ogs ▁are ▁important ▁to ▁the ▁main ▁characters ▁in ▁each ▁of ▁the ▁three ▁stories , ▁and ▁in ▁each ▁story ▁various ▁forms ▁of ▁human ▁loyal ty ▁or ▁dis loy alty ▁are ▁shown : ▁dis loy alty ▁to ▁a ▁brother ▁by ▁trying ▁to ▁s edu ce ▁the ▁brother ' s ▁wife , ▁dis loy alty ▁to ▁a ▁wife ▁by ▁keeping ▁a ▁mist ress ▁with ▁subsequent ▁dis loy alty ▁to ▁the ▁mist ress ▁when ▁she ▁is ▁injured ▁and ▁los es ▁her ▁beauty , ▁loss ▁of ▁loyal ty ▁to ▁youth ful ▁ideal ism ▁and ▁redis cover ed ▁loyal ty ▁to ▁a ▁daughter ▁as ▁a ▁hit - man ▁falls ▁from ▁and ▁then ▁attempts ▁to ▁reg ain ▁grace . ▁ ▁Dog f ight ing ▁is ▁b anned ▁in ▁most ▁Latin ▁American ▁countries ▁and ▁exists ▁as ▁an ▁element ▁of ▁the ▁under ground ▁economy ▁in ▁some ▁working ▁class ▁soci eties . ▁Although ▁violent , ▁dog f ight ing ▁provides ▁an ▁opportunity ▁for ▁Oct av io ▁to ▁make ▁money . ▁This ▁is ▁true ▁to