When you find blood, note its location. Is it high up on the bushes and far out from the trail? That might indicate arterial spurting. Does it seem to be in the center of the tracks, even though you took a broadside shot? That might be lung blood leaking out of the nose and mouth. Is the blood in the track? Maybe it’s running down the leg.
Is there green gunk on the ground with a little blood? That’s a gut shot. Resist the tendency to keep tracking that deer. Leave quietly and come back in the morning, or at least six hours later. A gut shot deer will lie down very quickly and if you leave it alone, it will die in that bed. Usually it will be relatively close to where you shot it. But if you keep pushing and jump the deer, they can turn into the Terminator, unable or unwilling to die and they can run for miles.
Did you find pieces of bone? Trust me, it’s not ribs as so many people think; 95% of the time it is pieces of leg bone. You may get that deer, but it’s not going to be easy.
A lot of blood at the start that turns into a few drips and then stops in a ¼ mile or so, is usually a low hit in the brisket. You are in for a long day with that deer.
With a leg or brisket hit, the deer is very mobile and will keep moving if pushed. If you can get some help, it’s best to place hunters along the escape routes and hope the deer comes by as you track the blood.