This is a very interesting thread. Thanks for posting!
I have to say I'm sure we can all point out different dogs that we've known that are both healthy or unhealthy and mixed or pure breed. I've owned both in my life time and have had the same issues with either dog. We had a large mixed breed that had hip dysplasia at 3 yrs of age. He lived to be 10. Now we have a large Great Pyrenees who is bow legged and is likely to have hip problems. I've got family members and friends who have both mixed and pure breed dogs and it's the same.
I'm just saying that you have to look at the individual dog and it's family tree (so to speak). Personally if I'm purchasing a puppy from a breeder like to know it's line's genetic history with health problems. Otherwise it's a roll of the dice and with so many dogs needed loving homes why not rescue one instead? IMO I'd chose a rescue dog any day of the week
