Hello this is my first build i hope you like it :) It's very good build cause you're hard to kill and deal a lot of dmg also. This build will be updated if anything change.
If u have anything that you want to exchange with me write at comment.
Please vote if u like, then I will make more builds and maybe I will try to make them look better :)

P.S. DO NOT VOTE OR COMMENT NEGATIVELY IF DIDN'T READ EVERYTHING

I use this set but you can also get: Glyphs for cooldown or ability power per level,Seals for mana regen,but i recommend armor per level or flat armor, marks can be magic penetration or armor penetration full,but it's good if u have some atk speed. Quints should be Magic Penetration or flat AP.

These are mine masteries and i like them very much but you can also go 9:21:0 or 9:0:21 or 21:9:0 :) With my 22:6:2 You got nice DPS, some survi and mana/health regeneration increased.
Havoc makes your autoattack and skills stronger. Trust me this 5% makes difference.

At start I always pickDoran's Ring, then goMercury Threads andChalice of Harmony for some magic resist and mana regeneration.Madred Bloodrazor is basic for Warwick so there is nothing to say bout it... NextWit End - a really usefull item it grants you with 50% atk speed and gives you boost to magic resist + you deal aditional magic damage at your autoattack.Guardian Angel is very usefull also cause you get armor and magic resist boost and aditionally you are granted with ressurection every 5 minutes :) This item can really get you out of opression and give team time to do something.
If game will go further I recommend you to getFrozen Heart, it will give you more armor and reduced cooldowns, also usefull passive which slows the attack speed of enemy champions nearby you. You can also getThornmail, which you can get when enemy AD champions are annoying you :)
Sometimes you can buy Elixir of Brilliance for ap boost and cooldown reduction.

Items really depends on situation and it's hard to say what will be good for you.

I RecommendFlash andIgnite.Flash is just needed to get you out of opression and sometimes to catch running enemies with Warwick's ulti or just deal the finishing blow with Hungering Strike or Ignite :). Ignite especially good for beggining of the match, when you're missing some damage, and also usefull to kill champions who can heal or drain fe. Soraka,Swain.
You can also pickGhost orExhaust to increase your chance for running away... But i really recommend Flash and Ignite

Eternal Thirst-Your passive ability that grants you with life steal (that's why WW is good jungler)
Hungering Strike-Your main DPS skill that deals good damage and heal you by 100% of dealed damage from it.
Hunter's Call- A skill that grant you and your allies bonus attack speed when activated.
Blood Scent-This is very usefull skill of Warwick.When the enemies are below 50% hp Warwick becomes enraged and grants movement speed boost. USE IT WISELLY. Turn it off when going to gank someone with hp below 50% and turn it on when you will be close enough to kill the target :) Very good skill for chasing wounded and a good thing vs tryndamere :)
Infinite Duress-Your ultimate that supress (stun) enemy target,it deal a lot of damage, and have a nice range. With this skill you can easily bring down one a single target or just intiate a fight, use it also to drain, cause it heals you by 100% damage dealt by it :)

+ Warwick is hard to kill when using this build
+ You have nice damage
+ You can play a role of tank with this build
+ Can easily solo Baron after picking Wit's End
+ Can intiate a teamfight with ultimate
- Might be focused in teamfights
- Might have problems before level 6
- You have to be on solo lane otherwise this build is worth nothing

With this build you have to be at solo lane cause you won't do a **** when you're not alone.
Use your Hunter's Call to increase your Atk Speed and autoattack, when you will have madred razor you will be farming monster and bring monsters one by one with insane speed.
If u don't have champion that needs a lot the blue buff you have to take him by yourself always.
Mana regeneration and Cooldown Reduction from it will make your game much easier.
Try also to have red buff cause it helps a lot when trying to kill enemy :)

Always make sure that your Blood Scent is off when going to gank otherwise you might fail.
If u want to increase your chances for succesfull gank get the red buff.
When close enough to enemy turn on your Blood Scent and use your ultimate to hold down the target and deal some damage, finish them with Hungering Strike and Ingite.