Simply put - can an animal companion, more specifically a boar, wear a Cloak of Resistance?
Boars are in category quadruped(hooves), which has the slots armor, belt (saddle), chest, eyes, feet (horseshoes), head, headband, neck, and shoulders. That's the Ultimate Wilderness list, which I believe is currently definitive.
If you are not in PFS, your boar has all of those open, so you can put a cloak in its shoulders slot. If you are in PFS, I believe you need to take the Extra Item Slot feat for it, limited to the above-listed slots, in order for it to wear anything at all.
Cool, thanks. I'll be buying my boar a cloak then. I need to get him Power Attack but I didn't want to retrain his Iron Will without a way to make up the bonus. Boars have a very low Will save.