Hi, this is my build for Warwick.
I am making this guide because i see so many Warwicks there got a bad early, mid and late game build with this build u will could solo a fed AD carry with full build.

In 5v5 i will recommend solo top for this build and when u got your ultimate try to catch your enemy in turret range.

This warwick is not a normal Warwick it is the tanky warwick!

I hope this guide will help you :)

I use this runes in 5v5 top lane because the most solo top laners are tanks like Yrick, Shen or Malphite.

So this runes should help u too kill ur enemies in top lane and survive.
The runes gives you Armor Penetration, crit, attack damage and attack speed that would be usefull for Warwick.

I will recommend a 21/9/0 masteries on Warwick.
Offense.
Summoner's wrath would make your exhaust more powerfull so it would be easy to kill enemies
Brute force Gives you more AD that would be usefull.
Alacrity Gives more attack speed and make Warwick heal more with hes passive
Weapon Expertise makes Warwick deal more damage
Dealiness gives Warwick a little bit more AD
Lethality gives Warwick 10% more critcal strike damage. that would mean if you crit 100 you now will crit 110
Vampirism gives you more lifesteal for more surviveability
Sunder make you to give more damage
executioner gives you more damage
Defense.
Resistance gives you more MR.
Hardiness Gives you more Armor that would make minions and monsters not damage you so much.
Durability gives you more hp per level.
Veteran's Scars gives you 30 hp from start and can be very usefull.

Boots: I choose Ninja Tabi because it's very awesome for more armor but you can also buy mercury's Treads for more MR if the enemy team got more AP than AD then buy mercury's Treads.

Wriggle's Lantern is pretty awesome for Warwick beacuse he would make more damage to minions but it also gives him Armor, Attack damage and Lifesteal that would make Warwick so OP.

Spirit visage is a MUST buy for warwick because it would make you Heal 15% more combined with your wriggel's lantern and your passive that wil make so much healing to you.

Wit's end gives you MR and Attack speed. Attack speed is awesome on i Warwick and MR will just make it more easy to survive.

Madred's Bloodrazor is MEGA awesome on Warwick bcause he is so tanky and got so much damage and a Madred's Bloodrazor's passive is so awesome that item will make you unkillable.

Guardians Angel is Awesome in Team fights because if you get focused u will revive and is just awesome on warwick.

I maked my Skill Sequence with no early max because all your spells is important.

Hungering Strike is a very good spell beacuse it makes damage and heal you so much

Hunters Call gives attack speed to you and your allies and gives alot of it

Blood Scent is super if you will be ganked by a jungler with 45% hp so can u see him and u will run alot faster, but it is also awesome to chase with.

Infinite Duress is your ultimate.
You will jump behind your target and stun it for 5 seconds and you will get alot of health

I will recommend you to take Exhaust and Flash because exhaust slow them and flash is your escape tool.
you can switch your Exhaust with Teleport or Ignite.

this is my guide to warwick hope you will enjoy it.
i got a comment at last.
when you are playing Warwick u need to play a little bit defensive or you will die to much.