Firstly, the breed choice depends on what type of deer or game you are hunting. The larger deer may take off farther away than smaller roe deer. Secondly, it depends on the individual working style of the dog or the breed. Thirdly and most importantly, it also depends on your own style working the trail, your ability to train the dog, and your character (that should suit the dog). Blood tracking is working as a team together with your dog. As far as I'm concerned, you may be able to train any kind of dog to track a blood trail, even chihuahuas, but it depends how patient and how experienced yo