From Pathfinder Lost Omens Draconic Codex, which isn't enabled.

Anti-Dragon Barding (Greater)

ITEM 12

COMPANION INVESTED MAGICAL

Price 1700 gp

Bulk L

Category light barding

AC Bonus +1

Dex Cap +5

Strength +3

Check Penalty −1

Speed Penalty −5 ft.

Consisting of long steel spikes projecting from light barding, anti-dragon barding helps to protect vulnerable mounts and livestock from massive aerial predators, including dragons, griffons, and rocs.

An animal companion wearing anti-dragon barding gains a +4 item bonus to its Fortitude DC and Reflex DC against attempts to Grapple, Reposition, Shove, or Trip it, and a creature that successfully Grapples the animal companion takes 3d4 piercing damage.

Pathfinder Lost Omens Draconic CodexORC