While blue can occur on other coat patterns, only blue eyes on merle pattern coats are show quality. (pethelpful.com)
The recent appearance of merle patterned APBTs and a couple breeders specializing in the «new» and «rare» color pattern has stirred up a controversy in the APBT community. (apbtconformation.com)
This cuts out one reason for producing double merles - perfect merle patterning in second generation litters - as these puppies can not be recognised and thus not shown. (pethelpful.com)