I looked into this quite a few years back and had good success getting my mutts with no experience tracking anything, to follow blood around my yard and eventually through the weeds with breaks in the blood trail and the 1st dog did great. Then my girlfriend took him when we split even though it was my dog. My next dog followed the trail alright, but licked up the blood as he went lol So I have mixed results. A Wirehaired Dachshund is the preferred breed because of it's small size (they go through brush where bigger dogs go around and try to pick back up the trail) and outstanding nose.
When I looked up the how to, they say it is easier to teach a dog to follow a blood trail then it is to teach them to follow a rabbit track. Rabbits run amongst other rabbits and critters and some dogs will mix up the scents and follow a different rabbit. Some dogs will drop a rabbit track and follow a deer track or another animals track. Whereas blood is a unique smell in the field so "they say" it is one of the easiest things to teach a dog to follow. Inspired I tried my house dog, a mostly beagle but not purebred or any papers, lost that one in the breakup. My second attempt was with a Golden Retriever and he was the blood licker.
Easy enough to find out if your dog will hunt, I just took the blood leftover in the bag every time I cooked venison, cut a small hole in the corner and made a trail around the yard with a treat at the end. There wasn't much blood in each bag so it wasn't like I painted a blood trail more like drips and drizzles. Start out small and work your way up to breaks 8-10 feet apart (like a deer jumping) and through brush and tall grass. Rookie tip: don't let the dog see you make the trail, my beagle skipped the trail and ran to where he saw me put the treat at the end lol I didn't start training them when they were pups, they were older dogs and in the house around a smoker so you don't need a $1,000 dog with papers to do it!
Hope that helps, good luck bud! Let us know how you make out.