Have 你 ever had a fancy 老鼠, 鼠标 as a pet?or wanted too?

No & no.

Go link 或者 even link if 你 want help. (And remember, 谷歌 is your friend.)

Here's my mice: link
...Some of them anyways.
They like to climb a lot and run a lot. All 你 really need is a large enough cage, bedding, wheel, and a water bottle.
I like all my mice, even the wild ones in my garage...They don't really bite me. Younger mice tends to bite 更多 (like around 2-4 weeks).