"Blood tracking" is a bit of a misnomer. If there is blood, you most likely won't need a dog. It's the bad shots, and the ones without blood that the dogs can save you. The best tracker I know trains his dogs to track the tarsal gland scent.
United Blood Trackers is dedicated to promoting resource conservation through the use of trained tracking dogs in the ethical recovery of big game. United Blood Trackers United Blood Trackers (UBT) welcomes you into the world of tracking dogs for the recovery of wounded big game. We are all...
www.unitedbloodtrackers.org
These are the guys you need to hook up with and learn from.