Brindle mouse?

All brindle mice are prone to super obesity. In fact, and red/yellow mice are. It's in their genes. :P

Recessive yellow, dominant yellow, Avy brindles, sables. . . . All prone to obesity.
I have a female here that is 128 grams.

I never had issues with any of my yellows. Although, after awhile I ended up breeding for pied blacks/doves. Though, that was towards the end of me having mice.