We made it though the "polar vortex," but not without serious effort. The horses' water tanks were kept open by my genius husband who used his computer guy background to set up a heating system and then monitored it all from his computer. If we can believe his equipment, the temperature got down to -39 (outrageous!) and stayed below 0 for several days. No one - horse, goat, dogs, cat, chicken, or human - was focused on much beyond staying warm. But we all made it through the cold, even the feral barn cat.
It warmed up enough that I was able to go out and take a few pictures that had been calling to me and to grab a quick iPhone shot of the shy barn cat.