MickeyMouseGal
<font color=deeppink>Have A Zip A Dee Doo Dah Zip
- Joined
- Feb 4, 2005
- Messages
- 2,609
I still don't see how that is any different then breading purebreds. It is still a crap shoot that all the 'good' stuff will end up in the puppy. The purebred could still have a recessive trait for whatever and the other parent have the same or different recessive trait and show up in the purebred puppy. Our dog came from a very reputable breeder, both parents have papers up the ying-yang, yet our dog has bad allergies and had her hip removed due to Leggs/Calves/Perths. It still happens no matter how careful you are.
Of course breeding is always a crap shoot. It is in people as well.

Most reputable pure bred dog breeders will not breed a dog that is showing genetic defects, and with DNA testing, we are starting to eliminate recessive traits as well-- such as PRA in Corgis. Backyard breeders (and I've seen just about as many badly bred pure breds as I have designer mixed breeds) will breed whatever they can get their hands on, genetic problems or not. The more financially driven the breeder is, generally the poorer quality the animal. Since designer mixed breeds are commanding more money and less paperwork than pure breds right now, they are common offenders of this.
Looking at it from another view, if you breed two dogs together that are collectively showing/carrying 10 different 'undesirable traits' such as bad skin, bad temperament, orthapedic problems, etc. you have a greater chance of rolling those traits in the game of genetic dice than if you breed two dogs carrying only one bad trait.
As for myself, I have had two Golden Retrievers who have NEVER had an ear infection (any Golden people here will tell you that this is no small feat)... neither did either of their parents. Coincidence? Absolutely not.