Also get some "flagging" and tag all signs you find. Gives you a good idea of direction of flight. Anyone ever shoot another arrow into the ground to mark where they shot the deer before they get down? I haven't, but thought it might be a good suggestion.

As far as tracking dog, if you're really desperate and your law allows, and there's no trained dog available, you can try this: If you have a dog of any sort of hunting lineage (beagle, foxhound, lab, retriever, terrier, dachsund, etc) put them on a leash and take them to the site. Take them to the spot where you shot the deer and put their nose down on the spot and then lead them to the first spot of blood and then the second. If you're lucky their genes may kick in and they may get the idea. I've seen it done with an untrained black lab and I've read of some non-hunting variaties of dogs having been trained for tracking. Even lousy sniffing dogs are better than any human.