He had tried to keep the critters out, but then he couldn't use it.
This is what I came up with....
The door next to it was fenced in for his dog, so I made a doggy door so his dog could go in the barn on cold nights but still be secure from critters.
Doggy door open...
Paint to match the barn... ish
Notice the top is wider than the bottom, these are definitely custom made doors. All said and done I enjoyed helping out my neighbor and had fun doing it.