I pretty much agree with everything FrostyPaws is saying.

The people who "lose" the traits they're breeding for only do so because they are not selecting the right individuals to inbreed on. They are inbreeding either on dogs that do NOT have the desired trait and/or on dogs that do not throw that trait.

Almost without exception, the very best dogs I have ever bred ad kept were inbred dogs ... and so, too, have some of the lamest dogs. I (like anyone) have inbred on the wrong dogs before ... but unlike many I have also inbred on the right dogs before.

Further still, and something so many people forget, even if you inbreed on the right dogs, you still have to be selective in the pups you choose. They will not all be the same "genetically." Keeping in mind that all inbreeding does is INTENSIFY TRAITS, a person must remember that some of your inbred pups will have all the SHIT in their gene pool intensified through the inbreeding ... while some of the pups will have all of the GOLD intensified ... and so it will be up to each person to be selective and "flush the shit" and carry forward with the gold

Jack