Pickaxe said:
I was under the impression (probably mistakenly), that spells with a target of "You" could only be cast on the familiar *instead* of on you, and that sharing (in the strict sense) was restricted to spells that targeted "a creature." Looking at the SRD, my interpretation is certainly not explicitly stated in the RAW.
Alter Self
is a spell that targets a creature.
Hold Person is a spell that targets a creature. Its target entry is not 'a creature', it's 'one humanoid creature'; non-humanoid creatures are excluded from what it can target; nevertheless, 'one humanoid creature' is 'a creature'.
Hold Monster is a spell that targets a creature. Its target entry is not 'a creature', it's 'one living creature'; non-living creatures are excluded from what it can target; nevertheless, 'one living creature' is 'a creature'.
Alter Self is a spell that targets a creature. Its target entry is not 'a creature', it's 'you'; creatures-that-aren't-you are excluded from what it can target; nevertheless, 'you' is 'a creature'.
Apart from that, I agree with you. You Share the spell 'Alter Self', not 'Alter Self into Troglodyte'. I can Share a Magic Fang with my animal companion, affecting his bite attack and my claw attack. I don't need to Share 'Magic Fang: Bite', just 'Magic Fang'.
I don't see any reason why I couldn't Share a Fire Shield with my toad, giving myself the warm shield and him the chill shield version.
Alter Self can affect a magical beast (so the special provision is unnecessary); it just can't turn him into a troglodyte.
-Hyp.