Pictures of dogs - dog boarding; English bull dog. Small puppies
Mixed breed dogs, on the other hand, come from a much larger gene pool, so the chances of chronic genetic disease are much lower. "Mixed breed" can be a misnomer because some "mixed breeds" may have no pure bred dogs anywhere in their linage. Therefore, mixed breeds don't develop any of the, well, "deformities" that are the hallmarks of pure breeds, like the Dachshund (back problems) or Bulldog (breathing and many other problems). Mixed breeds have evolved to the right size and shape of what a dog should be. And, since many pure breeds are bred for certain behavioral traits, mixed breed dogs are more even tempered.
http://choosing-a-dog-breed.blogspot.com/
