Share Spells (Ex): At the druid’s option, she may have any spell (but
not any spell-like ability) she casts upon herself also affect her animal
companion. The animal companion must be within 5 feet of her at the
time of casting to receive the benefit. If the spell or effect has a duration
other than instantaneous, it stops affecting the animal companion if the
companion moves farther than 5 feet away and will not affect the animal
again, even if it returns to the druid before the duration expires.
Additionally, the druid may cast a spell with a target of “You” on her
animal companion (as a touch range spell) instead of on herself.
note that it does not limit the spell to being a target spell just that the spell be normaly "cast opon herself"
then it adds that we can cast target "you" spells on the animal as a ranged touch spell
so call lighting is cast on me just as produce flame is cast on me.
as for the idea that its cast on the clouds well thats interesting because you dont need clouds, it can be cast underground, and it moves with you.
now i like that an animal cant understand how to call down lightning thats reasonable but as a master or many forms i can wildshape into the same animal as my companion and talk to it maybe i can teach it to call the lightning as a trick.