Solid Stance

--- When you stand on four legs, you dig into the ground firmly, making yourself particularly difficult to move. While in quadrupedal posture, you gain a +4 circumstance bonus to your Fortitude or Reflex DCs against attempts to Reposition, Shove, or Trip you. This bonus also applies to saving throws against spells or effects that attempt to move you or knock you prone. When you move, except to Stand, you lose the benefits of this feat until the beginning of your next turn.