I've got a wolf tail I wear everyday at home, and sometimes out and about, have had it a couple of years. It is one of the nicer inflatable ones(what I could find quick when I needed one), but a while back the air chamber split and then slipped down to the tip, so the tail was flat with a knob at the end. Just hung there..
Tonight I removed the air chamber adn re-stuffed the tail with hollow-fill. It looks SO much better, filled back out and fluffy, with just enough softness to flex when I walk. The added weight makes it move more too. Wish I had done this as soon as the air chamber split... only took about 30 minutes, too!