Pets

Companions
Players may select any creature from the list of animal companions as a companion or mount. As long as the mount has an Intelligence score of at least 3, it is treated as an individual, and the following rules apply. The mount may understand, but not speak, any one language that the player knows. It is considered combat trained for any related Ride checks, and does not need to be directed with Handle Animal. When mounted, both the mount and player may act off the player's initiative. Whichever creature acts first, they must complete all their actions for that round before the other takes their actions. The player's actions are still restricted by the mount's movement, and he may not make a full-attack action if the mount moves more than a 5-foot step, unless it's with a ranged weapon.

Players can choose to apply any of the animal companion archetypes to their companion.

Eidolons
The Mount evolution is not required to use an eidolon as a mount. The eidolon still must be at least one size category larger than the summoner, and be of the quadruped or serpentine base form. As an intelligent creature, eidolons are individuals, considered combat trained for any related Ride checks, and do not need to be directed with Handle Animal. When mounted, both the eidolon and summoner may act off the summoner's initiative. Whichever creature acts first, they must complete all their actions for that round before the other takes their actions. The summoner's actions are still restricted by the eidolon's movement, and he may not make a full-attack action if his eidolon moves more than a 5-foot step, unless it's with a ranged weapon.

Familiars
Players can choose to apply any of the familiar archetypes to their familiar.