Breeding a Dog

Dont want to sound like a parrot here but I think a dog should be proven first. Good drive from a young age and whatever else the owner would want out of the dog. ( build, temperament , range etc. ) this is just my opinion and im a very inexperienced hunter. But anytime I consider getting a dog or pup from someone I try to find out as much information as I can on background of the dog. Genetics are genetics and will be passed on in my opinion. A cull is a cull . Just like the serious deer hunters that practice Q.D.M. they try there best to manage there land and "cull" out the deer with the small or deformed racks to keep that from being passed on during the rut. But everyone is different and in certain circumstances I can understand breeding without proving a dog. But if you have the capabilities to make sure both sire and dam will be "up to par " I think it should be done. This is just my opinion but maybe one of these experienced fellas on here will chime in and give their advice.