What are you looking to do?
36 free dog house plans:
Here is a stylish one - https://www.hometalk.com/31318470/stylish-diy-doghouse
No matter what you do, it needs to be on a platform or at least concrete blocks to keep it out of the mud.
It needs to be weather proofed and finished so that it doesn’t break down in the elements, as in it needs to be sealed with caulk in the joints and at least painted with 2 coats of exterior grade paint.
I am partial to plans from Ana white. She has so many nice ones. Here's her website: https://www.ana-white.com/category/plans/tags/dog-house
Here's a simple one: https://www.youtube.com/watch?v=hvLmZZBDUu0
this may help: http://fordiyers.com/free-diy-dog-house-plans/
check that pin https://www.pinterest.com/pin/40250990407084597/