um you have to be sure that doesn't happen. A mouse/rat can eat its way out or hurt a snake severely. Either kill it or make sure the snake does. if a snake is used to eating dead, never feed live. They get complacent eating pre-killed and will stop constricting.

I have had snakes not constrict little pinkies before but I don't think you need to worry about that. Its kinda weird but they can't hurt the snake internally like a live grown rodent.