Hey everyone,
For some reason one of my female mice has a weird brown spot or dark area on her back. I noticed it today. All of her babies also have lost almost all their hair. Here's some pics
Mom,



One of the babies.



I feed TSC brand dog food. They're all inbred. I have 12 other bins set up with 1.2 in each and this is the first and only time and litter I've experienced this. They are outside in a shed. All my mice are fed the same thing and all out of the same water supply.
Could it be through inbreeding I has discovered a hairless mouse gene lol? And they're bot severely inbred I think 1 or 2 generations.

Any help or hypothesis appreciated, Jeremy.