It’s technically a 5–7–5 haiku, and the blunt repetition gives it a dry, almost absurdist humor. As a serious nature poem, though, it’s too literal: the second and third lines merely restate the first, without adding sensory detail, movement, or a surprising turn.
So: **good as a deliberately silly anti-haiku; weak as a conventional haiku.**
For example, keeping the same scene but adding atmosphere:
> cat warms the old mat
> one ear turns toward the rain—
> dusk fills the doorway