Cat whiskers don't need to be trimmed. Whiskers are very important to cats, serving multiple functions. Whiskers help cats measure width to determine if they can pass through narrow gaps or doorways, preventing them from getting stuck. Furthermore, whiskers help cats maintain balance when jumping or running, helping to prevent falls.

Therefore, unless there are special circumstances, it is generally not recommended to trim a cat's whiskers. If a cat's whiskers become problematic for any reason (such as illness, injury, etc.), it should be taken to a veterinarian for professional treatment.