"Măgarul său are o zi bună."

Translation: His donkey has a good day.

[vincemat]

Does this mean the donkey's day...

...is kick-ass?

[manatopthehill]

Good for him!

[alextoliver]

How do you know if său is his or her?

[SamJustin201]

It's all in the context. If you want to specify gender, you could use "ei" for hers and "lui" for his. Many times though, său/sa/săi/sale is used to refer to the subject of the sentence. For example, "El citește cartea sa" (he reads his own boom) vs "El citește cartea lui" (he reads someone else's book). This rule isn't concrete though, and many people don't follow it.

[SamJustin201]

He reads his own book*

[SayedElAraby]

Why wouldn't "his donkey has a nice day " be accepted?

[splittongue]

it should, it is correct, and idiomatic. Report it.

[BrianDefferding]

Does not magarul mean "The donkey"?

[I92P2]

Yes! but THIS Donkey HIS !!! )))

[aDdGPi11]

why does it give "her" as a choice, but not accept it -- there is nothing in this sentence to indicate it must be HIS donkey

[Abderrahim610706]

Nice day=good day