Fold the bottom left and right edges to meet at the center crease, forming a kite shape.

Fold one side up diagonally, then unfold and refold it down (rabbit ear fold) to make one ear. Repeat on the other side.

Fold the entire model in half along the original diagonal center line (kite folds inside).

Place the paper with the colored side down (if using colored paper). Fold the paper in half diagonally to form a triangle, then unfold to reveal a center crease.

Fold the sharpest point in to make the nose, or leave it long to serve as the tail.

If you meant a different kind of "paper" or instructions, could you please clarify:

Did you want instructions for a specifically? Origami Mouse Instructions

Fold the pointed top corner down to meet the center point of the bottom edges.