tracking
Most folks move way too fast sometimes messing up a blood trail. They are anxious to get their hands on their critter. Remain calm. Slow down. Find a drop of blood, track, hair, bone, ect. If its not a plain trail get down on your knees. Try to determine if the deer is bleeding out both sides. Use the terlet paper mentioned above. Pin it to the ground next to the droplet with a twig. Use the peroxide mentioned above it works! Try not to move much from the last drop till you see the next sign. Look up at wound highth on grass trees limbs ect. If you have to move up a little try to stay to the side of the trail to avoid messin it up. be patient , go slow don't give up untill your sure you have lost all sign. If you don't have good sunlight light have a really bright light available. Coleman lantern with a reflective shield works good. If that don't work come back in the morning when the light is better. After that its look in the direction he went first. Then grid search[really hard to do in super thick stuff] Deer are notorius for turning 90 degrees. Or doing a circle then continueing in the original direction but over to one side of the original. They will also circle out and watch their back trail then scare the crap out of you when they blow and spook. All of the above can be avoided if you have a good dog as mentioned above. If you believe the deer is down and ther is no sign recruit help for an in line search. Some times if you come back before daylight, slip in and listen for coyotes. Come daylight watch for birds. Magpies and crows have led me to a couple of deer.
Wayles