Here is some advice. Learn to track more than just blood. Learn how ants are attracted to blood that you can't see. How long it takes a spider to re-do it's web once broken. Learn how to stay on 1 particular set of tracks. Rustled leaves. Broken twigs.

I have helped track deer that people "could never find" and went right to the deer. Not by blood trail, by other signs.

I have a sheet somewhere if I find it I'll post it for you.