However, some breed standards describe only a level bite as acceptable; other breed standards accept the scissor bite. The all-breed judge must know which bite is or is not a fault for each breed that he or she judges. A given coat colour may be acceptable, it may be preferred, it may be the only acceptable colour, or it may be a fault. Sometimes these colours change over time, often after much in-fighting and bitterness.For many years, the only acceptable coat pattern in a Dalmatian was white with black spots, very recently liver spots have been accepted as a variant, but black still appears to be the preference of most. However, other colors like with lemon, blue, brindle and tricolor spots are disqualified. A black German Shepherd Dog is penalized; a white GSD is disqualified, as the color is believed to be linked to deafness and other serious health problems. Many GSD fanciers like the white colour and continue to breed for the white coat; some lobby for its acceptance into the breed standard, others argue for the creation of a new breed. In the future, genetic testing may show which of these variants in color are actually linked to health problems and which are not, which may lead to modification of the breed standards. Other breeds such as the Flat-coated Retriever only black and liver are acceptable, but yellow is a disqualification. Working dogs The breed standards for working dogs usually specify that scars, broken teeth or other damage that evidence injuries sustained during a working career (often termed ‘honourable scars and injuries') are not to be penalized in conformation showing. The Australian Cattle Dog is an example of this as are some terriers, where the breed standards specifically state that scars are not to be penalized as faults in conformation. Details of breed standards and precise definition of faults are decided upon by breed clubs and are often hotly debated. Sometimes even minute details are argued over by fanciers and breeders to a degree that would astound the average pet owner who never plans on breeding his or her pet. Fanciers note that such irrelevant seeming qualities have the capacity to change the breed over time. Often it is the breeders of working dogs who are the most vehement, pointing out that changes in fashion and fancy have led to what they see as a loss in working