Level: This is the character's druid level. The druid's class levels stack with levels of any other classes that are entitled to an animal companion for the purpose of determining the companion's statistics.

HD: This is the total number of eight-sided (d8) Hit Dice the animal companion possesses, each of which gains a Constitution modifier, as normal.

BAB: This is the animal companion's base attack bonus. An animal companion's base attack bonus is the same as that of a druid of a level equal to the animal's HD. Animal companions do not gain additional attacks using their natural weapons for a high base attack bonus.

Fort/Ref/Will: These are the animal companion's base saving throw bonuses. An animal companion has good Fortitude and Reflex saves.

Skills: This lists the animal's total skill ranks. Animal companions can assign skill ranks to any of the following skills: Acrobatics, Athletics, Escape Artist, Fly, Influence, Stealth, and Survival. If an animal companion increases its Intelligence to 10 or higher, it gains bonus skill ranks as normal. Animal companions with an Intelligence of 3 or higher can purchase ranks in any skill. An animal companion cannot have more ranks in a skill than it has Hit Dice.

Feats: This is the total number of feats possessed by an animal companion. Note that animal companions cannot select a feat with a requirement of base attack bonus +1 until they gain their second feat at 3 Hit Dice.

Natural Armor Bonus: The number noted here is an improvement to the animal companion's existing natural armor bonus.

Str/Dex Bonus: Add this modifier to the animal companion's Strength and Dexterity scores.

Special: This includes a number of abilities gained by animal companions as they increase in power. Each of these bonuses is described below.

Link (Ex): A druid can handle her animal companion as a free action, or push it as a move action, even if she doesn't have any ranks in the Handle Animal skill. The druid gains a +4 circumstance bonus on all wild empathy checks and Handle Animal checks made regarding an animal companion.

 

Bonus Talent: The animal companion gains a bonus (form) talent

 

Native Environment (Ex): While in its native terrain, the animal companion gains a bonus equal to half its level on checks and saves to deal with environmental hazards.

Ability Boost (Ex): The animal companion adds +1 to one of its ability scores.

Devotion (Ex): An animal companion gains a +4 morale bonus on Will saves against charm and enchantment effects.

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Master of the Wild (Ex): The animal companion gains an ability based on its native terrain, as follows.

• Cold: The animal companion can see through natural weather conditions without penalty, ignoring any cover or concealment from such effects. If the effect is created by magic, the animal companion instead triples the distance it can see without penalty.

• Desert: The animal companion gains a +4 morale bonus on Will saves against illusion effects.

• Forest, Urban: The animal companion gains Skill Focus (Stealth) as a bonus feat.

• Jungle, Mountains: The animal companion gains a climb speed equal to its base land speed, or increases its existing climb speed by 10ft.

• Plains: The animal companion increases its base land speed by 10ft.

• Swamp, Water: The animal companion gains a swim speed equal to its base land speed, or increases its existing swim speed by 10ft.

• Underground: The animal companion gains a burrow speed equal to its base land speed, or increases its existing burrow speed by 10ft.