So many flat tails out there can be saved with this one neat trick!
Don't be scared to fluff up your tail or other stuffed things if they are staying to look a bit... Sat on! Breathe new life into the most flattened stuffed things with new or re-fluffed stuffing!
Use the seam ripper carefully, just on thread and not the fabric backing. Open a hole as large as your fist to remove and replace stuffing. Give your fur a quick wash in cold water and liquid detergent if it needs it! (Hang with a fan to air dry, no heat) if you wanna get extra fancy sew in a zipper so you can maintain your stuffing more frequently!
Puff that tail back up!