dcollins
Explorer
Silveras said:p. 179, Scent spell
The text of the Scent spell indicates "a creature may take a partial action to note the direction of the scent.". There are no partial actions in 3.5. This probably should be a free action.
At least per my 3.0 DMG p. 81, this is a just a reiteration of the normal rules for Scent. "Noting the direction of the scent is a standard action.", etc.