This isn't a super great one but sometimes you might need it:
Level: Drd 2, Rgr 2, Sor/Wiz 2
Components: V, S, M
Casting Time: 1 standard action
Targets: One touched creature/level
Duration: 10 min./level
Saving Throw: Yes (harmless) or Fortitude negates; see text
Spell Resistance: Yes (harmless) or Yes; see text
This spell conceals any odors emanating from the subject thereby making it impossible to detect using the scent ability. Creatures with the scent ability do not gain the bonus to Survival checks for scent when tracking a creature protected by scent mask.
If this spell is cast on a creature with an odor-based special attack, such as a troglodyte, the creature’s special attack is negated for 10 minutes if it fails a Fortitude saving throw.
Arcane Material Component: A scentless flower.