No rule for this one
No ending or word group predicts the article of Maus. Learn it as a pair and say it out loud: die Maus.
die Maus
It's die Maus. Maus is feminine, plural die Mäuse.
Die Maus funktioniert nicht.
The mouse isn't working.
No ending or word group predicts the article of Maus. Learn it as a pair and say it out loud: die Maus.