Health conditions relating to colour

Skin
In dogs, there are several tardive follicle dysplasias, including colour dilution alopecia. This is found in some dogs bearing the coat color genotype dd, which renders black genotypes blue and liver genotypes beige or fawn. This syndrome is best known in Doberman Pinschers but is also commonly seen in colour dilute Dachshunds, Italian Greyhounds, Greyhounds, Whippets, Yorkshire Terriers, and tricolour hounds and has now been reported in a German Shepherd. Affected dogs are born with normal hair coats but before 1 yr of age begin to develop folliculitis and hypotrichosis that is progressive and confined to the blue or fawn coloured areas.
Nose
A not predominantly black nose would include a nose with a non-insignificant amount of pink on it. A genetically black nose can turn pink as a result of an injury, but will return to black after a healing period. A genetically pink nose is always pink and can sunburn and lead to cancer.