We also have to understand that we don't even go these lengths within our own species (at least the majority of parents). Lots of people have children even though they are aware of "genetic defects", yet they still find a way to love them. You have to find a balance between perfection and enjoyment. Obviously Fanconi is a big concern, I will not downplay that, but other things that are not life threatening can be managed. We do it with ourselves (no one here is perfectly healthy) and find a way to live our lives.
What a very interesting analogy between humans and our beloved Basenji's.
Many of us here love our dogs at least as much as others love their human children. The extent to which we go to protect and love our pets would appear to know no bounds in many cases. We fight for their health and admonish others to do the same with a great passion as can be seen on many of the forum topics such as this one. A pure breed basenji with all bad traits carefully and selectively removed. It is for the greater good, to keep the line pure without defect.
Now lets flip this to the human side.
A little man called Adolf Hitler also had a passion for a pure Aryan race. Breeding for blue eyed blond haired white boys and girls. In practice this would most likely produce a superior human in many physical respects. Not allowing inferior races with genetic defects to breed or interbreed would insure the survival and dominance of this race. Imagine how fit and healthy this race would be. No heart conditions to shorten their lives in fact no conditions at all just healthy long living humans.
So what was so wrong about this seemingly logical goal that the rest of the world came to war and millions died. The problem was???well the rest of the world. You may have noticed the we are mostly NOT of the Aryan race. Sucks to be us in an Aryan world.
What is my point??.well I do not have a point really just an interesting observation. I love the B?s and testing for diseases and defects is a must but who draws the line at where we stop. I only like the reds so all others should be banned (not really).Who says we are cruel to extend the life of our dogs if they are badly injured or sick and in pain yet these same people say a human in the same position must not have the choice but must suffer to the last. The world is made up of lines and everyone must make their own decision where that line is drawn. The problems occur when your line crosses mine or the other way around. It is not where the line is drawn that causes the problem but how we react to that line which is not where we would like to see it.