My husband built one of these for our feral cat "Ghost Cat". He, and the other strays, have used it every winter and on rainy days. It is easy to make and they seem to like it. Outdoor cat house shelter for outdoor cats
Build This Easy DIY Outdoor Cat Shelter for Your Cat or Strays
The Kitty Tube - Insulated Outdoor Cat House with pillow and NEW Door Awning - Introducing The Kitty Tube - fully insulated outdoor cat house. Improvements include a brand new awning over the door, a positive fitting lid, better wet weather protection, h
Winterhaus für Streunerkatzen:How to build a feral cat shelter. The Humane Society suggests placing two shelters with their doorways facing each other and securing a board between them to create a canopy.