I agree with Reuben about finding out what you have in the solo scenario. I agree with Kevin that putting a dog where there are plenty of hogs and sign that a dog with even half the want to could produce something. What I take from Reuben's thinking is that they produce in more difficult situations, less than ideal. Puppies can produce in heavily populated areas or hot sign. But, when the track is difficult, or there might not be but one ol' hog in an area and your dog still gets the job done then you have a measuring stick.
I agree...a good dog should find game even when scarce...