is considered to be a Large animal for the purpose of determining its carrying Capacity.

has advantage on Strength and Dexterity Saving Throws made against Effects that would knock it prone.

Attack a creature with a powerful donkey kick

Your Cha score increases by 2 and your Con score increases by 1

You are always under the effects of the spell "Speak with Animals".
You do not have hands or arms, and such, cannot carry things very effectively. Anything that affects hands or arms does not affect you, as you have none.
You have four legs and feet. Anything that affects legs or feet affects all of yours.
You are quadrupedal, and have your speed reduced by 25 ft when on 1 or 2 legs, reduced by 15 ft when on 3 legs, and, obviously, reduced to zero feet when on no legs.
You ignore the somatic components of spells, as you have no way to perform them, unless it's spells that require specific, expensive items, in which you may use your mouth to carry the components.
Spells that cause something to appear in your hand either cause it to appear on the ground in front of you or have no effect. Spells that cause something to come out of your hand(s) (like burning hands) instead cause that thing to come out of the air in front of you.

You have adventage on Deception (charisma) check when trying to pass as a normal doney as long as you're not wearing or carrying noticeable items.

You can speak, read, and write in common and one language of your choice