Is it doing them more harm than good to be providing them with a wading pool in sub-freezing temperatures? I have 2 ducks and it's 15F right now. They have a 5 gallon rubber container that I am planning on using as a wading pool for them so they can get their pool fix.Obviously it gets taken out sometime during the day and will be refilled again the next day. I am concerned about them getting wet in those temperatures though. Will I be doing them more harm than good by allowing them to swim in it at least in the morning?