From Pathfinder Advanced Player's Guide
The feat Improved Share Spells:
Prerequisites: Spellcraft 10 ranks, ability to acquire an animal companion, eidolon, familiar, or special mount.
Benefit: Any non-instantaneous spell (but not any spell-like ability) you cast on yourself can also affect a creature bonded to you (such as an animal companion, eidolon, familiar, or special mount). The creature must be within 5 feet of you at the time of casting to receive the benefit. The spell’s duration is halved between you and your bonded creature (for example, a spell with a duration of 1 hour has a duration of 30 minutes for both you and your bonded creature).
If the spell or effect has a duration other than instantaneous, it stops affecting the creature if it moves farther than 5 feet away from you. It does not affect the creature again if it returns before the duration expires. You may share spells in this fashion even if the spells normally do not affect creatures of that type. This feat only applies to animal companions, eidolons, familiars, or special mounts gained through a class feature.
The feat can't be selected for characters that have an animal companion through the Animal Domain's, Animal Companion power.
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This fix required touching several sets. It's fixed, but I can't easily get you the changes right now without breaking your copy. But I've made it so anything that gains the Animal Companion, Familiar, Special mount or Eidolon will qualify (At least to the best of my ability).
Thank you for fixing that Andrew.
Don't worry i am not in a hurry to get it, i just saw an error and wanted to help correct it.