This guy has a 13 years old blond lab and he decided to build her an air conditioned dog bed.
He is building a plenum and used 1×6 boards for the frame and 4″ PVC piping for the air inlet.
He took an old PC power supply and mounted to the frame, then added the fans to the inside of the air inlet.
He stretched the fabric really tight across the frame and secured with the fabric fasteners. His dog is over 100 lbs so the fabric had to be super tight.
He loaded the tube with frozen water bottles, the fans draw air through the pipe and the ice bottles cool the air.
Source: JadaNeedsaDoggie on Reddit