Try to think about where the deer would be running to... and Then also like the others have said back track. Deer do crazy things after they have been hit... Look for tracks, turned up leaves broken linbs on trees, blood on leaves that are on small bushes... Remember that blood does not have to be on the ground. He could have brushed up against a tree and left a spot even though it was not dripping... Also If you have too, find the last spot you found blood and get on you knees, and start looking, keep in mind where you think the deer might be going... One other thing I have tried is a DOG... Does not have to be a trained dog, as long as he has somewhat of a nose... I used a Lab, put him on a leash and got him on the trail, and once he gets that blood going though his nose, he began to follow the trail, just a thought... Hope something here helps... Good luck...