Paladin lvl 15 mount, share spells and spell resistance interaction

[Redpieper]

Hi everyone, quick question.

Can a level 15 paladin share spells with his mount or does he have to contend with it's spell resistance? Relevant abilities below:

Share Spells
At the paladin’s option, she may have any spell (but not any spell-like ability) she casts on herself also affect her mount.

The mount must be within 5 feet at the time of casting to receive the benefit. If the spell or effect has a duration other than instantaneous, it stops affecting the mount if it moves farther than 5 feet away and will not affect the mount again even if it returns to the paladin before the duration expires. Additionally, the paladin may cast a spell with a target of "You" on her mount (as a touch range spell) instead of on herself. A paladin and her mount can share spells even if the spells normally do not affect creatures of the mount’s type (magical beast).

Spell Resistance (Ex)
A mount’s spell resistance equals its master’s paladin level + 5. To affect the mount with a spell, a spellcaster must get a result on a caster level check (1d20 + caster level) that equals or exceeds the mount’s spell resistance

[Redpieper]

Does anyone know?

[Dagroth]

Does anyone know?

An intelligent creature (which the mount qualifies as) can lower their spell resistance voluntarily. They raise it again the next round... I can't recall if that is a swift action, move action or standard action though.

[Zanos]

Shared spells aren't cast on the mount, they just affect it. I would say that bypasses the mounts SR.

Lowering SR is pretty harsh action wise. It takes a standard and only applies for one round, so you have to spend a standard every round to keep it down.