Like members before me already stated, a BYB is anybody who does not breed to better the breed. Thus, anybody who does not health test their dogs, does not show their dogs either in conformation or in the field, breeds unacceptable or abnormal varieties ("Imperial Shih Tzus", parti-color poodles [AKC DQ], "Tiny Toy Chihuahuas", etc.), and anybody who breeds for money is a BYB.

Now, there are also irresponsible breeders who are every bit as bad as BYBs. Irresponsible breeders may health test their dogs, they may show every once in a while and have a couple CH's here and there. They may love their dogs dearly, but they are ignorant. I once knew a breeder who, on the outside, seemed like a reputable breeder. However, her dogs began throwing dysplastic pups. Yet, she denied any genetic link and continued to breed her dogs without a second thought.

There should only be one type of breeder: one who strives to produce puppies even better than the parents of the pups. A responsible breeder is one who produces stronger, healthier puppies truer to the standard. Any breeder who does not follow these rules is a BYB/irresponsible breeder.