Are we keeping them timid, or making them aggressive? That will factor into the feat selection greatly. I think I'd prefer them as simply "mice of unusual size".
In that case...
Skills: 15
Hide, Listen, Move Silently, Spot?
Feats: 5
Alertness, Improved Initiative, Lightning Reflexes, Run, Stealthy?
Having seen mice run, I wanted to give it Fleet of Foot, but it's Dex is too low. Bonus feat?
Maybe Jump, too, if they're anything like pet rodents I've seen. Frankly, though, I could see the skills you have with Hide at 6 and the rest at 3.
Make it a bonus feat and keep the others as listed. Sure.
That's all fine.