Os monstros do Pathfinder que usam sua garra de pé normalmente têm o rake especial ataque (e não dois ataques de garra adicionais):
A creature with this special attack gains extra natural attacks under certain conditions, typically when it grapples its foe. In addition to the options available to all grapplers, a monster with the rake ability gains two free claw attacks that it can use only against a grappled foe. The bonus and damage caused by these attacks is included in the creature’s description. A monster with the rake ability must begin its turn already grappling to use its rake—it can’t begin a grapple and rake in the same turn.
Por exemplo, o tigre tem dois ataques de garra e um ancinho (2 garras +10, 1d8 + 6) como um ataque especial, não ataques de 4 garras.
Outro exemplo com um eidolon summoner pode ser obtido por 2 pontos de evolução:
An eidolon grows dangerous claws on its feet, allowing it to make 2 rake attacks on foes it is grappling. These attacks are primary attacks. The eidolon receives these additional attacks each time it succeeds on a grapple check against the target. These rake attacks deal 1d4 points of damage (1d6 if Large, 1d8 if Huge). This evolution is only available to eidolons of the quadruped base form. This evolution counts as one natural attack toward the eidolon’s maximum. The summoner must be at least 4th level before selecting this evolution.
(ênfase minha)
Isso, a menos que você tenha uma anatomia estranha, sugere claramente que você não pode fazer um ataque de garra com os pés.