Pet mouse in sewer world - one word title

A young mouse named Fievel and his family decide to migrate to America, a "land without cats," at the turn of the 20th century. But somehow, Fievel ends up in the New World alone and must fend off not only the felines he never thought he'd have to deal with again but also the loneliness of being away from home.

Some time after the Mousekewitz's have settled in America, they find that they are still having problems with the threat of cats. That makes them eager to try another home out in the west, where they are promised that mice and cats live in peace. Unfortunately, the one making this claim is an oily con artist named Cat R. Waul who is intent on his own sinister plan.

A mouse fools Scat the cat into thinking that he's from another planet.

Two nearly starved and tired mouses arrive in a paradise where there is plenty of food.

The Pink Piper attempts to lead the mice out of town.

A man and a mouse move to a village by the sea where everyone has a pet. Their first morning in town, the man puts the mouse in his shirt-front pocket and sets out on a walk. People with parrots on their heads or leading a cow, a camel, or a whale all shun him once they see the mouse. So, the man returns home, puts the mouse in a box, closes the lid, and builds himself a new animal companion. He takes it for a walk. Is the mouse forgotten?

Mice roaming around.

A city rat pursues a nearly empty bag of cheese snacks that's drifting in the breeze. His journey takes him through a vent into a highly mechanized rat lab, where one particular white female gets his attention.

Bessie is doing the dishes when a mouse makes his presence known in the kitchen. She calls for an exterminator.