I originally posted this last year, but feel the need to repost every once in a while to clarify some things.
My aunt was a housekeeper at WDW for 14 years andrecently retired. The towel animals were always meant for guests to take home if they wanted. Therefore, the towels that the housekeepers used to make the animals were towels that were going to be taken outof "service" due to fraying, looking ragged etc. That's why they were not always left for guests becausethere had to be some that were going to be "retired". Not only did there need to be towels available to be made into animals, the housekeeper had to have thetime to make them up. They were always meant to be something special, not expected. And as guests started complaining (and there were a TON) that they"are paying $$$ for the room" or "tipping $$$ and not getting towels animals every day", they have decided to stop the practice. Though there still are somehousekeepers that enjoy doing it so much that theywill still do it. But as a whole, they are not encouraged to any longer. So if you do get some, enjoy. But don'texpect them.