Prairie Rider Feat 1
Source Pathfinder Advanced Player's Guide
You grew up riding your clan's shaggy ponies and riding dogs. You become trained in Nature. If you would automatically become trained in Nature (from your background or class, for example), you instead become trained in a skill of your choice. You also get a +1 circumstance bonus to Command an Animal if the target is a traditional halfling mount, such as a pony or riding dog.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
HalflingA creature with this trait is a member of the halfling ancestry. These small people are friendly wanderers considered to be lucky. An ability with this trait can be used or selected only by halflings. A weapon with this trait is created and used by halflings.