Frequency's important, too. -rereads first post- Wait, 3 years old, and on the corner of a comforter, next to a price tag, it looks tiny. That thing looks like it's been starved for years. One mouse a week... They definitely should have given it more mice or switched to rats at some point. Doesn't mean you shouldn't buy it, though. You can pack the meat on.
Actually, it's got a really reduced pattern. You could probably breed for that if you're into that later on.
It's definitely a nice pickup and a good deal. Nothing wrong that you can't easily fix. You won't even have to do anything special to fix it, just feed it properly. It's cheaper and quicker to feed one item than a bunch, so there may be the challenge of switching to rats.
When fed properly, they reach and maintain a certain size and girth. They look healthy and well fed. I just don't get how people don't recognize this.
I would at least try to give her a gentle heads up about this for her future reference.
Mice only get so big. Petco adults here weigh 30g.