If you want to look into it, shed soldier dogs (find them on facebook) does a TON of training. They will sell you anything from untrained to fully trained dogs. They are pricey, but their dogs put in some great work. I also know a friend who has trained his own dog, he told me that an important factor in training the dog is getting good sheds that aren't "humanized". He said to find some fresh sheds and keep them away from the house and limit the human exposure and they help the dog find the bone and not the "human" scent.
Good luck!!