My Bp does not accept prekilled mice,this wasnt a problem before because they where pinkies or little fuzzies. but now i need them a little bigger and i afraid of the mice bitting my snake. i want to know a good way to get around this, ive been told of knocking out the mouse by wacking it against the tank but by knocking it out i run the risk of killing it or even it not moving wont my snake think its dead??