my dad shot at a doe this year and we started tracking her and we have massive amount of blood. Then we found her bedded down about 80yrds away. we got to about 10yrds of her and she took off leavin very little blood, we never found her cause my dad gave up, one thing that i read a couple days later is that a deer could lose 30 to 40 percent of its blood and still continue on its way, so just because u have good blood to begin with dont mean they will go down shortly.