A catch dog differs from a strike dog the way a wide reciever differs from an offensive lineman. They play the same game, but their jobs are totally different. A strike dog should be expected to leave you and go find, stop, and bay a hog until you get there. They can be as loose baying or rough as you prefer. A catch dog has no responsibility to find a hog, his job is to catch, hold, and control the hog while you deal with it, and never let go until called or broken off. There should be no back up in a catch dog. You want a catch dog that wants to catch the hog, not fight it. One thing I forgot to add above is that if the seller won't take you on a hunt with the dog, walk the other way. Hope I have been of some help.