This guide will persist of a what I would say a standard Warwick jungle should be. Warwick is played as a tank in this guide and will not be a "kill" everything in end-game.

Pros:

Fast jungler
Good ganks after level 6
Ad carry destroyer
He is a werewolf
Fun to play

Cons:

Not the best ganking before level 6
Bad escape mechanism

Smite - is a must to have as a jungler or the jungling will be too slow

Exhaust - This spell is very effective when you gank and can get your team fb often.

Runes are ad runes with some armor.

Masteries
0/21/9

Tank + some sustain. Look up in the masteries for details.

Due to the fact that Warwick is an easy jungler, we will start out with Long Sword and a potion, because he can sustain without the other items due to his passive.

After that just follow the guide, you might wanna get some other items if you get fed alot like Frozen Mallet to better hunt your enemies or if there are more bruiser/tanks on your team you can go sorceress shoes.

In the end you can change your Wrigle's Lantern with a Bloodthirster so you can do some more damage, you will be enough tank at this point and you are not going to jungle that much anymore.

Start at wolves and ask your (1 of your) teamnates to damage the wolves and leash the blue. Remember to use w at both places. Finish the big blue golem before the small ones as when you get level 2 take your q and eat the small ones for life.

Continue to wraiths and then golems; take the big golem first as you will get level 3(take w again); remember to spam your spells, so you will have enough hp to kill red. While you are killing red buff take the potion. The wraiths are again ready and when you get level 4 take e and you are not ready to gank. If there are no lanes that are pushed, then keep jungling or go steal their jungle, but watch out because you have no escape abilities except your Exhaust.

Remember to cover your blue: it will spawn around 7.20.

What, I need to gank?

Yeah, if you don't you WILL be flamed in every f******* game.

How to gank:
All the time when you jungle, look at which lanes that are getting pushed, because these are the lanes you should be ganking.

Ask the lane if they know where they have warded, and avoid it.

Top lane:

**** yeah ! This lane is the best lane to gank, because there is so long way for the enemy and it's 2v1 and if you have exhaust this could be an easy kill.

Mid lane
This lane can be very hard to gank pre-level 6, so I usually avoid this lane until I am level 6.

Bot lane
Focus should be on the carry and if you have exhaust on him, your ad carry should be able to toast him while you auto-attack him with your w.

After level 6 it get's quite easy; just ultimate the carry>ap>others when you gank. Mid will most likely like to have a gank, so stand in the bush and wait for the ap to get near, but don't wait too long, you don't want to go behind in levels of the other jungle.