I actually did that once with a fuzzy mouse - fed it with milk off of a piece of sphagetti and got it to full sized. One of my friends kept it as a pet as he didn't want me feeding it to the snake after it had such "a hard life". Didn't seem that hard to me I spent hours every day raising the little sausage.:)
still it lived for yonks and was a complete sook - used to hide in my hair at every available oportunity.
dr del