I'm sorry, I just have to interject regarding pure breds and rescues and mutts. Not all breeders of pure breds are reputable and therein lies the problem with illnesses. If you go to a breeder who knows their dogs lines, is extremely keen on the genetics of those lines and is honest, you will rarely get a pure bred with the illnesses common to those breeds. It's when you have dishonesty, greed and stupidity that the illnesses come into play. Also, someone breeding pure breds that gives dogs out to just anyone with no concern about whether or not the person can handle the breed is not a reputable breeder. I never believed in getting pure breds before buying one at a pet store (first mistake.) Then, after I got to know many, many breeders I learned of this entire other world. My first pure bred came from a puppy store via a puppy mill. She died of leukemia at 3 yrs. My second pure bred I rescued and this dog ultimately came from a backyard breeder who just didn't have a clue. We're still waiting to see what develops as far as illnesses. My next pure bred will come from a much more reputable breeder. A lot of rescue dogs come from homes that couldn't handle the breed and often times ended up abused, puppy mills, and backyard breeders. So you have to be careful. Mutts can be the most amazing dogs, as long as you get the right mix. And when you get too many mixes in a single mutt you never know when a certain characteristic you weren't aware of will come out, or even what illness lurks inside of the poor dog. Don't get me wrong, I have met tons of awesome mutts and I do not discount them at all. Sorry for the long rant.