Hello, im TheNoobBuild. I will give tips and and reasons why i play warwick this way.
I will cover :
-Runes
-Items
-Skill Sequence
-Summoner Spells
-Pros/Cons
Theese are tips on how to play warwick.

Why I choose cooldown runes is because:
-Hungering Strike will be very useful getting hp fast with blue buff
-Hunter's Call will be open much faster much faster in team fights and in the jungle increasing clearing speed
-Warwick's Ult is be able to be used almost every single gank.
Armor Seals and Quints:
-Helps you through jungle
-You mostly gank top and bot where there are mostly ad champs
Attack speed Marks:
-your attack speed will be 2.400 and very effective with your build

Warwick is suppose to be a tanky ad/ap dps. I hate when people dont use him right and build him an adc build with him. At the end of you build you should have berserker's greaves, wits end, madred's bloodrazor, frozen mallet, randuin's omen, and a blood thirster.
Why?
Warwick should have high attack speed.
Your berserker's greaves, wits end, madred's bloodrazor, combined with your hunter's call is good enough.
For magic dps you have wits end and madred's bloodrazor.
For ad dps you have blood thirster and madred's bloodrazor.
Also blood thrister will give you sustain for team fights.
Frozen mallet and Randuin's Omen are great items for warwick.
They Slow both slow and with warwick's great movement speed he can almost kill anyone.
They also give him great amount of health. Building into randuin's omen with heart of gold will give you extra money if you dont have many kills that game.
One last thing is you can switch randuin's omen with maw of malmortius if they have an ap based team. Why do this any way? If you want more ad this is a great choice.

Hungering Strike:4,10,12,13,14
Hunter's Call:1,3,5,7,8
Blood Scent:2,9,15,17,18
Infinite Duress:6,11,16
Why max hunter's call first? Well this warwick is an on hit build making attack speed great for him. Clearing speeds will be faster within the jungle.
Why blood scent as your 2nd point? After wolves and blue I go strait to the enemy red and counter. With blood scent and bloods you will get the kill. Instead of exhaust you could get flash incase they have flash.

Jungling:
First I get blue and wolves then head for enemy red for a counter. I will almost 100% of the time get the kill and maybe first blood. Steal the red then if you have a dececnt amount of hp then gank mid. After go to your red and ward. If you can do wraiths a then go back. This is the start of you jungling sequence i use with this build.

Pros:
-Great jungling champ with life steal
-Ult is great for ganks
-Good at chasing
-Great damage on anyone
Cons:
-Not the best early game
-No Slows, Stuns, knock up, blah blah blah until level 6

Thanks for reading this guide.
Please vote and comment.
I would really love to hear you ideas and opinons.
Also check out my talon build. TYVM

http://www.mobafire.com/league-of-legends/build/talon-left-some-blades-in-mid-242760