Seen the documentary. My hands were constantly twitching with an unbearable desire to slap faces.
I find it utterly surreal that people can be so blind so as not to see how inmoral it is to purposefully breed animals with obvious and serious pathologies. It´s not just ignoring it, it´s actually seeking it (as they comment in the documentary, to the point of culling healthy animals). I think in the majority of purebred dog keepers it´s a matter of gross ignorance, but in the case of professional breeders, vets and people involved in those horrible shows, i get a real sense of evil :S People who are aware and yet delude themselves into thinking it´s ok and justify it with ridiculous excuses deserve no sympathy whatsoever from me. They are cruel, inmoral bastards, and that´s to put it mildly.
If people who desire brachycephaly, heart problems, blindness, spina bifida, etc, on their animals, really love them, it´s the sickest most disgusting sort of love i´ve ever heard off.
I have a little disagreement with breeding for practicality. Sure, if you take into account the breed´s welfare and health while enhancing a characteristic that doesn´t have negative effects on them, that´s fine with me, but sadly, that´s not reality. When people breed for practicality they are also dramatically increasing inbreeding and selecting for "bad genes" unwittingly. Plus some useful (for us) characteristics imply pathologies in the animals. In defense of past generations, they didn´t know better nor did they have the means to do something about it had they known. Today, that´s not an excuse anymore...
This problem is so widespread in captive animals nowadays that it really makes you despair. When the boxer in the documentary was having a seizure i kept thinking of spider ball pythons and enigma leopard geckos. The world of reptiles to my mind has a terrible future...but it´s everywhere....there´s not a single widespread captive bred "pet" that doesn´t have examples of problems (some mild, some bloody terrible) caused by terrible, ignorant, based on insane standards, artifitial selection.
I also have to say that even at the level of skin coloration things can go really wrong. Some fenotypic variations appear to be entirely harmless (as is the case with many lines of melanistics, erythristics and such things) and i have no quarrel with those, but others have a different genetic origin and can sometimes be the manifestation of a pathology as it the case with spider ball pythons, or be associated with kinks and malformations.
One final thought, whoever thought brachycephaly was a "good" thing was dumber than a box of rocks.
Edit: Sorry, after all the agonizing rambling, Grete had beat me to it xD