If you're buying a hunting dog make sure to look at the parents history. If the parents were good hunters you can be somewhat confident your puppy, with the right training will also be a good hunter. A not so scientific rule of thumb is to look at the puppies grandmother's lines and her history, it can be a good indication of what traits your dog may have. Don't get hung up on color but do your home work on the family tree, it can tell you a lot. Of course you ultimatly have to put the time into training the dog. Good luck