Last time I checked the reason for the shorter life span on the larger breeds was not due to inbreeding or genetic problems...the reason for the shorter life span on a large breed animal is due to the size of the heart. As for the genetic problems that are reported with the Cavalier King Charles, as compared to the mixed breed reports..that is simple. It all comes down to money. Breeders are willing to fork out the money to discover genetic faults in a line, so that they can eliminate them. Whereas with a mixed breed...well while an owner desires to know what illnesses their dog is going to have, they are not going to be breeding that dog, so the millions that get invested in an entire breed will not be invested into one mixed dog.   See 4 other replies

The statement that mixed breeds are healthier than pure breeds is false. The genes a dog inherits from its parents determine that. If the parents have hereditary diseases, it'll be a stronger chance that the offspring will have those diseases, mixed or purebred. On a side note, I hope everyone understands that the bigger the dog, the shorter the life span; whether the dog is pure or mixed. If you get a Dane mix, you'll like see a similar life expectancy as a pure Dane.As a longtime fan of dog shows as well as an active member of a dog rescue group, I understand both sides. The advantages of purebred dogs is that you'll know the size of the dog, coat length and grooming demands and most importantly, the temperament! With mixed breeds, it's a guessing game for all factors.A large majority of breeders love the breed they show and do everything possible to ensure the protection of the breed, including selective breeding to discourage genetic defects and other issues. If you attend one of these shows and see what the owners/handlers/dogs go through to show off the beauty of the breed, you'd have a better appreciation for the event. There is no torture but it's certainly grueling for all involved, animals and humans alike!   See 4 other replies

Dear Christian, Excessive breeding is widespread across most breeds. That's why breed dogs have on average two years shorter life expectancy than mixed breeds -- that over 10%. Some breeds -- incl. Wolfhounds, Bloodhounds, Great Danes, Mastiffs, .... -- can only expect to live 6-7 years. To be specific, take the Cavalier King Charles Spaniel -- a widely popular breed. The Kennel Club and breeder friends have made this a genetic basket case, with a list of genetic failures that's too long to mention -- look, e.g., at this compilation: http://www.cavalierhealth.org/ . It is shameful that we create these disfigured mutants just because they fit some twisted ideal of a dog breed, with little or no resemblance to the original breeds a century ago. Surely most breed owners love their dog, but don't realize the situation.   See 4 other replies

That may be the case for the rare breeds, but I thought reputable breeders made sure not to inbreed their dogs for the very reasons your stating. I'm no expert, but that was my understanding.   See 4 other replies