Okay so I'm not the best at poetry so please bare with me.
Answer:(I hope) I believe that 'The Law' of the jungle is not strong just on its own. I mean there has to be people...or animals to support it, to make it stronger. (see what I did there)
It says, "For the strength of the Pack is the wolf, and the strength of the Wolf is the Pack." They both support each other which make the law stronger.
((Hope this helps))
