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How much blood do you think a mouse has?
The average blood volume for a laboratory mouse is ~6-8% of total body weight.
Read more: http://wiki.answers.com/Q/What_is_the_blood_volume_of_an_average_lab_mouse#ixzz1APt0twOe
I'm not entirely for sure about mice, but I know squirrels tend to have a decent amount.