This is my Udyr build hope you enjoy.

Pros Built in life steal Insane pressure Chase effectively AoE Ability Short Cooldowns late game

Cons Needs to snowball usually to win lane Long cooldowns early game Not enough mana

Skills Taking this skill sequence allows you to have you full shield early and 18% life steal by lvl 9( in turtle stance)
This skill sequence provides a lot of damage early and lane sustain if you dont have enough money to buy what you need.

MasteriesOptional Masteries

Team work is very important for Udyr

Udyr's Blazing Stampede is very useful in teamfights because of its stun and Movement speed increase you can go in stun their highest damage target and switch over to Wilding Claw and just do insane damage in a few seconds. Also Udyr's Wingborne Storm stance is extremely useful if all of their team is low and retreating just Blazing Stampede in to get close and then use the AoE effects of Wingborne Storm to secure the kills of 1 or more of their crippled team.(I'm not saying go 100% pure man-mode I'm saying if you are confident in your abilities to clean up then enemy team then go for it.)

Udyr's Iron Mantle is also completely effective if you go full tank and it is your job to absorb all the damage while still getting health back and doing damage then Iron Mantle is your favorite thing ever.

Udyr's unique skills are he has no technical ultimate ability
In my opinion his ultimate is his Wilding Claw it allows him to just deal massive amounts of damage in a few seconds

Rune ChoicesI use this if I want to stay in lane far longer than my opponentThese runes seem pretty scattered but they work if I don't take Attack Speed items early and think I need more health in the beginning and more Movement speed on top of my boots to escape easier.

Quoted:

"Feral instinct guides our fist."

Udyr's farming like everyone else's is vital, but for Udyr it keeps him in lane with his turtle stance constantly giving him his health back you need to farm effectively, but I can't give you tips on farming because I'm am terrible at farming.

Summoner Spell Choices

is used to secure kills early game and really nothing else is used to catch up to enemies in Blazing Stampede if you don't have enough movement speed and also as an escape tool if you over extended and almost got caught out of position

is used to escape just like Ghost but for shorter distances and only to secure kills and get over walls to get a farther lead. is used to like all the others to secure a kill or escape if you don't have enough movement speed initially with Blazing Stampede

Item Decisions

Wit's End This item is a great choice on because it gives Attack Speed, Magic Resist, Does Magic Damage, and Steal enemy Magic Resist and gives it to you until the stacks run out
Bloodthirster This item is also great giving you up to 12% life steal( out of Iron Mantle) and at least 70 Attack Damage
Randuin's Omen This item is awesome on Udyr because of the Armor, Health, and its Active Effect all compliment Udyr's talents well.
Spirit Visage Again another great item for heavy damage and Ability power team comps, also with its passive effect you can easily heal up a lot of damage quick.
Trinity Force This item isn't the most useful on him but it does make his kit more together giving boosts almost every where (I'm not recommending this item, but you can use it.)
Mercury's Treads Ninja Tabi These are you usual boot choices depending on their team comp you decide which you need.
Thornmail This item is really only used against 100% Attack Damage team comps that focus on dealing all the damage they can to your team having no tanks at all.
Guardian Angel This item is awesome on Udyr because of the revive when you die and the 50 Armor, and 40 Magic Resist
Ravenous Hydra This item is great for the Health Regeneration, Damage, Active Effect, life steal, but i only really use it when I need fast wave clear and I'm split pushing.
Banshee's Veil This item works well when you have to initiate because its passive allows you to absorb 1 ability damage free and I believe it refreshes ever 25 seconds without you being attacked.
Frozen Mallet This item is pretty awesome on Udyr, I mean it synergizes well with your tiger stance allowing you to maximize your damage output with its slow effect and it gives you quite a bit of health to get tanky late game.
Muramana This item will come to you sometime mid, or late game depending on how you spam your abilities, but if you didn't know this item is made when you get full mana stacks from the manamune, I think you should only build this item if and only if you believe that Udyr is very mana hungry
All in all just choose the items that fit your playstyle the most Gl Hf

People believe that can only be played as a 100% tank, but you won't experience his true potential if he is only a tank, yes he can be played like that, but you won't really do much damage which Udyr is really good at.

Build 1

Ninja Tabi These are my usual boots on Udyr because of their passive, blocking damage from champion's basic attacks this slows down the enemy's adc's damage output, next would be my Wit's End a lot of you think this weapon is horrible, but my reasons for using it are it synergizes well with Udyr's kit because if you run in with Blazing Stampede, then switch to Wilding Claw with all of the attack speed Wit's End gives you can really do all of insane damage (also it gives Magic Resist)
After that I mainly go for a Randuin's Omen for its slow active and the health and 70 armor making me slightly more tanky for their Adc, soon after I go for a damage item mainly a Ravenous Hydra or a Frozen Mallet, The Ravenous Hydra is for way more damage and everything it has to offer, The Frozen Mallet is for its slowing ability and the health and little Attack Damage it gives, After that I particularly go for a Magic Resist item like a Spirit Visage or a Banshee's Veil something along those lines (it usually is the Spirit Visage because I think it is better than the Banshee's Veil), the last item is situational like if their team is heavy Ability Power, then I get a Maw of Malmortius or if they are heavy Attack Damage then I get an Atma's Impaler because it gives armor crit chance and Attack Damage according to how much health you have.

---

Build 2
Now this is for the 100% tank Udyr's out there you will take either Ninja Tabi or Mercury's Treads depending on their team like usual, you will still take the Wit's End because the Magic resist and it will still allow you to do tons of damage, then depending on their team again you will most likely grab a Sunfire Aegis or a Spirit Visage or a Randuin's Omen or a Banshee's Veil all are good choices depending on their team, after grabbing one of those items you will start probably want to get more health to stay in fights longer so you will try to get a Warmog's Armor because hello the passive on it and the health it provides, after the extra 1000 health if you grabbed it you will most likely get another of the 4 previous items I put above Warmog's Armor because you don't have all 4 yet and it also again depends on their team, Now you are at 4 items probably if you want more damage but still some Magic Resist and or Armor depending on their team you will grab a Mercurial Scimitar or a Maw of Malmortius or for Armor you will grab a Atma's Impaler those are your damage choices and only 1 item is left you decide out of all the items you can possibly build now and choose what fits you best.

---

Build 3
Ok now this is for anyone who plays damage Udyr and has Mana issues you get and early Tear of the Goddess for that stacking mana and then build it into a Manamune so you get some Attack damage from this item, then you will most likely grab a tank item if you are still going half tank, half damage you will most likely grab a tanky item of your choosing like a Randuin's Omen or a Spirit Visage or another tanky item, next you will probably want damage wave clear and the ability to survive so if you haven't caught on yet what this item is you can grab a Ravenous Hydra or a Wit's End because you can clear waves with Attack speed also, if you grabbed the Wit's End next you will probably want another tank item so I'm gonna list a few like Sunfire Aegis , Spirit Visage , Banshee's Veil , Locket of the Iron Solari , etc. Now you should have a Muramana which will give you more Attack Damage and Mana so now your mana hungriness is gone, now after getting a tank item you will probably want damage so I suggest getting any of these items, a Bloodthirster , Maw of Malmortius , Mercurial Scimitar , Atma's Impaler , or anything that tickles your fancy.

I Hope You All Enjoyed This In Depth Udyr Guide If You Have Any Question Put Them In The Comments Section

THANK YOU For Reading

May all of you have fun on the Fields of Justice