1) This is partly true. The reason why the *observable* products of natural selection are much healthier is just because the not healthy ones are selected away, by the said natural selection. The products of breeding are made to achieve some particular qualities, but they often do not consider all the parameters that would be useful for an existence in the wild - and they often don't have much respect for the animal either. For instance you want to get birds with nicer colors, or cows with more milk, or horses who run quicker, but they are only specialized to do those things, and they are actually not so good for survival in the wild. 2) "The term ‘backyard breeders’ is commonly used in the U.S. to describe a breeder with a lack of knowledge and experience; while the term ‘puppy mills’ or ‘puppy farms’ refers to businesses that mass produce puppies of different breeds. Animal rights activists claim that breeding dogs in order to sell them is unethical, attacking breeders whom they believe are more concerned with profit than the animals' welfare. Critics cite breed registries for encouraging the inbreeding of dogs thereby contributing to a proliferation of genetic disorders. Animal rights group PETA has compared the American Kennel Club to the Klu Klux Klan, claiming that AKC adds to the pet overpopulation problem by encouraging breeding pure bred dogs when millions of dogs are killed yearly in US animal shelters. Veterinarian and author Dr. Michael Fox claims that, "The best use of pedigree papers is for housebreaking your dog. They don't mean a damn thing. You can have an immune- deficient puppy that is about to go blind and has epilepsy, hip dysplasia, hemophilia and one testicle, and the AKC will register it" " Source and further information: http://en.wikipedia.org/wiki/Dog_breeding#Criticism