Hi im Craziemouth and this is my guide to Warwick. I see many people jungle with Warwick and i have tryed jungling myself but i just cant do it. Also i can never seem to own on 5v5 the way i do on 3v3. So eventually i gave up on 5v5 and jungling but not on Warwick. And after many hours of playing i have made a guide that rapes on Warwick 3v3!
It is mainly a Procwick hybrid Lanewick Build.
This build does work on five vs five!

Pros
High damage
Easy health gain
Fun to play
Strong ultimate
Fast moving
Magic and Physical damage
Awesome skins
Cons
Averagly squishy with no defence items
Takes getting used to

There are many rune choices on WW i mainly use Armour Pen reds, AP yellows, Cooldown reduc blues and Health quints. This gives me great damage good suvivability and nice lane presence.
If anyone has any runes they think work better post them and i will test.

You may think that the masteries i use dont give enough defence but with the life steal you get from your Q and passive you dont need defence for early game and late game you get it from your items. Also with these masteries you should start with 63 AD so even on your basic attacks you do nice damage.

I like to start with a Dorans ring. You may think WTF?!?!?!? DORANS RING? But Dorans Ring is actually the best starting item for WW. When i first saw Lanewick builds using it i thought the same and i tryned and tryed again to use a Dorans Blade and Shield. Please just use the Ring then you can skip the lose streaks i had from early game failing with Blade and Shield.
so any way i get Dorans Ring because it lets me lane for ages because my Q heals and lets me do lots of damage.
I use Sorcerer boots because your Hungering Strike and Procs/On Hit Effects do magic damage so this really scales up your damage early and late game.
I then get Madreds Razors for easier farming IMPORTANT Dont rush Madreds Bloodrazors please its is to expesive so you are left damage less for half the game and early game (if you do get it early) the damage isnt reliable.
I now get Wits End because it givesyou a great 42 damage on hit (stacks with Ulti)
and it increases Magid Res for those pesky casters and it lets you take a few spells without getting to damged if you intiate with your ult.
After Wits End I get Spirit Visage this may sound stupid but this is pretty much your lifesteal item because it stacks with your passive. It also give some nice cooldown reduc and some tanky stats.
OK now you can finish your Bloodrazors i know youve been dieing to. This item is great it massivly boosts your damage and it just looks so cool. Its one of the best WW items ever.
I like getting malady now but if you are getting focused i would suggest getting a defensive item like sunfire (because it helps with your ult) or banshees (because if you have shield and someone trys to stun you while ulting nothing will happen) or any defensive item you want im not picky.
There are many items you can get here but my favourite item is black cleaver. I like this be cause it means i have alround good DPS so say there is a galio i would have black cleaver and it wont matter he has a ton of MR because my Physical damage will be high. But a GA or pretty much anything works here as i said im not picky.

This is simple
R>Q>E>W
R is main priority because it does awesome damage high level and locks donw a champ and is your ult.
Q is second to max because maxing it gives higher health damage percent ration, higher base damage and lower cooldown.
I max E next because it goves you a really nice speed buff and at lvl 5 its range is almost all of the TT map.
I max W last because my items give me enough Attack speed but i normally get 1 point in it when me and my team start pushing turrets.

Ok you may think Exhaust and Ignite are nooby summoners but on TT there the best.
Team fight helping summoner skills out class movement summoner skills on TT.
Other Summoner skills
Flash
Ghost
Cleanse (if they have 4 or more CC's)
Heal is... ok

I know this topic is kind of old but many people (including me) stopped play Lanewick and warwick in general because of this but actually it did nothing.
Ok so WW used to get 100% of damage back as health but now its 80%...
Wow big woop this dosnt reduce the heal much early game when you need and late game you shouldn't rely on it, it can still pull you out of stick situations and do huge damage though.
So all in all this was no major change.

here is proof that it works:


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And again:


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This was after trying the build again for about 12 games there is a game cut off where i went 20/1.

Well i hope this guide helps with you Warwick games any constructive critism welcom. (first guide be nice)

Hope it works for you!