Easy way...braid the tail, fold it and keep it in a child's tube sock. Cut the top of the tube sock from the top down about four inches. Turn it inside out and put your hand in, grab the braided tail and pull the sock over the tail, take one cut piece and pull it through the tail at the top of the braid and tie it in a knot...I have a whole bag full, take one dirty one of, put a clean one on and wash them...cheap and easy. One mini wears a medium childs because her tail is so thick, the other a childs small....I also use Healthy Hair, but if you want a very long and pretty tail, the trick is keeping them for stepping on it when they get up from lying down. I use a large rubber band when I fold the tail in half because if I don't the sock becomes stretched out and a lethal weapon when they swat a fly..like getting hit with a baseball bat, lol..