All the animals eat bread. Except for the cat. The cat eats the other animals.
at first my brain switched to english and i thought it was "the cat is eating a MOOSE"! oops
When en/et comes before a word it means 'an', while when it comes at the end of the word it means 'the'.
MUS (common gender)
en mus → a mouse
musen → the mouse
HUS (neuter gender)
et hus → a house
huset → the house