During the laning phase you will want to always look for an opportunity to get klepto/grasp stacks by using bear stance to stun your opponent and following it up with a tiger stance.
If you are low on mana use your corrupting potion and stay back until you get a sufficient amount of mana back.

Having ignite on this build is extremely useful when duelling other champions since it increases your damage output substantially, especially earlier on when you have 3 points into tiger stance. You pretty much want to always use ignite in a fight if they have a large amount of healing.

If fed, you can easily roam into the enemy jungle and kill them/take enemy buffs. Staying in lane and pushing to further turrets is also really good since it draws a lot of attention to top, allowing other lanes to push, also you are probably able to easily escape or even 1v2/3.
If you are not fed it is probably best to stay in lane and farm until you have at least 2 items. Ganking bot lane with this build is probably best since, if not overly fed, the enemy ADC will not be able to do much damage to you if you have a frozen core. Also, try to be present in team fights since you can soak up a lot of damage.

Udyr isnt really a tank at heart, he does a lot of damage and has a **** ton of sustain + chase potential, therefore amping these aspects by even a small amount will achieve major results when fighting enemy champs.

Cons:
Can be kited pretty hard
Not that tanky until later in the game

Pros:
Surprisingly high damage
High sustain
Fast
Good poke
Good laning phase
Very tanky