Foxes don't take damage when falling into pointed dripstones

Mobs who don't take fall damage also won't take damage when falling into stalagmites. Foxes, however do take fall damage but won't take any from falling into stalagmites.

There is also a case to be made that mobs who don't take fall damage should nonetheless take damage from falling into stalagmites (with the exception of "floating" mobs like chickens and blaze).