Shadowstar added in Druids animal companion info, as follows:
Druid Table
1-2:
HD+0 AC+0 Str/Dex+0 Bonus Tricks 1 Link (+4 Wild Empathy and Handle Animal checks), Share Spells
3-5:
HD+2 AC+2 Str/Dex+1 Bonus Tricks 2 Evasion
6-8:
HD+4 AC+4 Str/Dex+2 Bonus Tricks 3 Devotion (+4 Save vs. Enchantments)
9-11:
HD+6 AC+6 Str/Dex+3 Bonus Tricks 4 Multiattack (if no multiple attack forms the creature gets an addition strike at -5)
12-14:
HD+8 AC+8 Str/Dex+4 Bonus Tricks 5
15-17:
HD+10 AC+10 Str/Dex+5 Bonus Tricks 6 Improved Evasion
18-20:
HD+12 AC+12 Str/Dex+6 Bonus Tricks 7
More Animal Listing
Ok all of these consider the level at which you get them level 1.
Level 4
Ape, Black Bear, Bison, Boar, Cheetah, Crocodile, Dire Badger, Dire Rat, Dire Weasel, Leopard, Monitor Lizard, Large Shark, Constrictor Snake, Large Viper Snake, Wolverine.
Level 7
Brown Bear, Giant Crocodile, Deinonychus, Dire Ape, Dire Boar, Dire Wolf, Dire Wolverine, Elasmosaurus, Lion, Rhinoceros, Huge Viper Snake, Tiger.
Level 10
Polar Bear, Dire Lion, Megaraptor, Huge Shark, Giant Constictor Snake, Orca Whale.
Level 13
Dire Bear, Giant Octopus, Elephant
Level 16
Dire Shark, Dire Tiger, Giant Squid, Triceratops, Tyrannosaurus.