Hello summoners. This may not have all you need for rengar but i am suggesting a build for jungleing that may be vary powerfull. This is the build i use and is has been a succes untill now. I wanted to share it with all of you. Good luck and Have Fun !!!!!!

1.i have nothing to say about the boots feel free to select any boots you like i prefer mercurys.
*the lantern is an item i believe all junglers need allthough i believe it is not needed in the end
2. i take the bonetooth necless it is a usefull item even if you pick up some early kills and assist it helps you allot.
3. next item is the frozen mallet due to its ability to slow yout opponent it stacks with rengars E.
4. next is atmas impailer due to its stack with health witch gives you more attack damage + crisical strike witch is very good due to rengar is meelee and has his Q passive attack speed.
5. due to critical and attack speed next item is Bloodthruster witch makes you eaven powerfull.
6. to make all the above even more powerfull you pick up the phantom dancer and at this point if you have a good game you will be unstopable.

*the lantern is no use in the end i believe because you want to replace it something more powerfull like bloodthruster.

Wraiths
Red
Golems
Wraiths
GANG IF POSSIBLE TOP OR MID
Wolves
Blue GANG BOT OR MID IF POSSIBLE


Continue with the same sequence and gang wherever is possible.

This build need allot more explenation and has not much. But for now stick to the build i suggest if you like and use the spells wiselly. Further explenation of renger in the future.