So I am an 11th level druid and I have the Natural Bond feat along with the Improved animal companion feat. I have a dire bear and I have read and read thread after thread about leveling up your companion. Could anyone please help me out with stats? Please? 
Hit Dice: 12d8+51 (105 hp) - since I went up 10HD should it be 22d8+88, and if so why did it go from 105 to 88?)
Initiative: +1 - I think this will go to +8 because I will bump the dex and get improved initiative
Speed: 40 ft. (8 squares)
Armor Class:17 (–1 size, +1 Dex, +7 natural), touch 10, flat-footed 16 - I think it will be 31 (-1 size, +4 Dex, 17 Natural)
Base Attack/Grapple: +9/+23 - NO idea on how to factor this with new HD and str increase
Attack: Claw +19 melee (2d4+10) - Same as above
Full Attack:2 claws +19 melee (2d4+10) and bite +13 melee (2d8+5) - again I'm a n00b
Saves: Fort +12, Ref +9, Will +9 - Will these really only go to Fort 12 Ref 10 and Will 10?
Abilities: Str 31, Dex 13, Con 19, Int 2, Wis 12, Cha 10 - +5 str and dex plus 2 stats from levels?
Feats: Alertness, Endurance, Run, Toughness, Weapon Focus (claw) - +2 more feats?
— Also I should get 6 extra tricks correct?
Thank you all!!!

Hit Dice: 12d8+51 (105 hp) - since I went up 10HD should it be 22d8+88, and if so why did it go from 105 to 88?)
Initiative: +1 - I think this will go to +8 because I will bump the dex and get improved initiative
Speed: 40 ft. (8 squares)
Armor Class:17 (–1 size, +1 Dex, +7 natural), touch 10, flat-footed 16 - I think it will be 31 (-1 size, +4 Dex, 17 Natural)
Base Attack/Grapple: +9/+23 - NO idea on how to factor this with new HD and str increase
Attack: Claw +19 melee (2d4+10) - Same as above
Full Attack:2 claws +19 melee (2d4+10) and bite +13 melee (2d8+5) - again I'm a n00b
Saves: Fort +12, Ref +9, Will +9 - Will these really only go to Fort 12 Ref 10 and Will 10?
Abilities: Str 31, Dex 13, Con 19, Int 2, Wis 12, Cha 10 - +5 str and dex plus 2 stats from levels?
Feats: Alertness, Endurance, Run, Toughness, Weapon Focus (claw) - +2 more feats?
— Also I should get 6 extra tricks correct?
Thank you all!!!