The blue color in German Shepherds is the result of a dilution gene. This recessive gene dilutes any black pigment on the dog including coat color, nose leather, foot pads, toe nails, lips, etc. It also affects their eye color. Blue pups have a beautiful light gray coat as babies, as they age however is usually darkens up quite a bit, the ones that darken up are called "steel" blues. To the untrained eye, they can be mistaken for regular blacks.There is also "Powder" blues, they tend to lighten up in color and always stay a very noticeable gray color. Powder blues are not seen to often.
Blue German Shepherds whether steel blue or powder blue will also have light eyes, they usually stay bright blue till about 6-12 weeks of age then they go through varying shades of green and yellow, usually ending up yellow/amber or a light shade of brown.
To learn more about the different colors/markings in the German Shepherd breed, visit the sites below. We have a couple blue colored German Shepherds (See Rose, Glory, Eve, Hutch & Dex), we do not breed specifically for any color, but will occasionally have blue puppies. We do NOT charge more for blues. Be aware of breeders who charge more for blues, saying that they are "rare." I myself think they are beautiful! But remember you should never pick a dog just because of its color, color should be one of the last considerations.