The Chinese crested was officially recognised by the Fédération Cynologique Internationale in 1987, by The Kennel Club (UK) in 1981, by the American Kennel Club in 1991,and by the Australian National Kennel Council in 1995. There is a rescue group that specializes in rescuing the breed from shelters in the United States, It's called Naked K-9 and small dog rescue. They always have Chinese Crested Dogs available for adoption.
The Hairless allele (the wild type) is a dominant (and homozygous prenatal lethal) trait, while the Powderpuff allele acts as a simple recessive trait in its presence. Zygotes that receive two copies of the Hairless allele will never develop into puppies. Thus all Chinese cresteds carry at least one copy of the Powderpuff allele.
The Powderpuff trait cannot be bred out because it is carried by all Chinese cresteds (even the hairless ones). All Hairless Chinese crested have the ability to produce Powderpuff puppies, even when they are bred to another Hairless. On the other hand, Powderpuffs bred to another Powderpuff can never produce hairless puppies, since they do not carry the Hairless gene.
Data refer : http://en.wikipedia.org/wiki/Chinese_Crested_dog