Beast of Burden. The mule is considered to be a Large Animal for the purpose of determinining its carrying capacity.
Sure-Footed. The Mule has Advantage on Strength and Dexterity Saving Throws made against effects that would knock it prone.
Hooves. Melee weapon attack: +2 to hit, reach of 5 ft, one target. Hit: 3-4-6 1d4+2 Bludgeoning Damage