Dog breeds are dogs that have relatively uniform physical characteristics developed under controlled conditions by humans, with breeding animals selected for phenotypic traits such as size, coat color, structure, and behavior. The Fédération Cynologique Internationale recognizes 337 pure dog breeds. Other uses of the term breed when referring to dogs may include pure breeds, cross-breeds, mixed breeds and natural breeds.
For example, a bill currently under consideration in New Jersey would ban breeders from selling dogs outside the state unless the sale was made face-to-face. If you are a breeder in New Jersey and a potential buyer in say, California, is interested in one of your dogs, this buyer would have to come to New Jersey to see and buy the dog. Or the breeder would have to take the dog to California. This is obviously onerous and unnecessary. It also adds a tremendous expense to the cost of the dog. This kind of legislation is proposed in the name of “consumer protection” but it is actually meant to punish and discourage dog breeding.
In Great Britain the Kennel Club maintains a list of “vulnerable native breeds.” This refers to breeds that were developed in the UK which register fewer than 300 individual dogs per year. There are currently about 29 breeds on this list, with more breeds on the Watch list, meaning they are close to Vulnerable status. Although the Kennel Club in Britain registers fewer dogs than we do in the U.S., the situation with purebred dogs in the U.S. is similar. While the Labrador Retriever - the top dog registered by the AKC for over 20 years - has tens of thousands of individual registrations every year, other breeds have far fewer numbers. Beyond a few popular breeds, most breeds have relatively small numbers of dogs registered each year. We have many breeds in the United States which register only a few hundred individual dogs per year.
When large dogs eliminate, they eliminate a lot more than small dogs. More goes in and more comes out of large breeds. Which is something to keep in mind if your dog will live inside - especially if you live in a high rise apartment and he will have to be litter box trained (there is always going to be more to clean up).