General | Combat Stamina
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Undersized Mount (Combat)

Source Gallows of Madness pg. 26, Advanced Class Guide pg. 159
You’ve learned techniques that allow you to ride beasts of smaller sizes than normal.

Prerequisites: Ride 1 rank.

Benefit: You can ride creatures of your size category, although encumbrance or other factors might limit how you can use this ability.

Normal: Typically a mount suited for you is at least one size category larger than you.

Combat Trick (from the Combat Stamina feat)

Source Pathfinder Unchained pg. 135
While you have at least 1 stamina point in your stamina pool, the DCs of your Ride checks to leap with a mount of your size, and to perform a fast mount or dismount with such a mount, decrease by 5.