Your summoned creatures have a knack for surviving combat and helping you do the same.
Prerequisite: Augment Summoning.
Benefit: Each creature you conjure with any summon spell gains a +2 enhancement bonus to its armor bonus (increasing the creature’s total Armor Class) and saving throws. If you are adjacent to one of your own summoned creatures, you gain a +1 dodge bonus to AC.
Adventurer’s Handbook: Genius Guide Volume 1