I used to stack my square bales on pallets in my barn (no hay loft) until the varmints (skunks) decided that was a great place to live (under the hay - between the two layers of the pallets). If I were going to stack my hay on pallets again I would be sure they fit snugly against each other and I would fasten boards vertically (on edge) along the sides so that critters could not get under there.
Pat G., in MN
