Is there such thing as a white German shepherd?

White German Shepherds are usually bred to have an overall softer, more mellow, more sensitive personality than traditionally colored (black and tan) German Shepherds.
Because of this sweeter temperament, White German Shepherds are almost never used in protection dog sports such as schutzhund. A White German Shepherd can be a good watchdog, but his "watching" is usually limited to alerting you that someone is coming. White German Shepherds are not typically aggressive.
In fact, if a White Geman Shepherd is going to have any temperament fault, it's more likely to be timidity or skittishness. White Shepherds need a great deal of early socialization to build a confident attitude toward strangers and strange situations.
White German Shepherds do need the same physical and mental exercise as other German Shepherds. This smart breed should not be relegated to a home that simply wants a casual pet to walk around the block.
White German Shepherds can be quite vocal, tending to whine, mumble, and grumble in attempts to communicate with you.
Though they seldom have dominant personalities, White German Shepherds can still be a bit hard-headed. All large working dogs, including White Shepherds, need a confident, consistent owner who will establish and enforce rules.

If you want a dog who...

Is strong, athletic, and natural-looking
Has a "softer," more mellow personality than a traditionally-colored German Shepherd
Thrives on challenging activities and exercise
Is exceptionally intelligent, loyal, and versatile -- when well-socialized and well-trained, can learn and do almost anything
Makes a sensible watchdog and is not inappropriately hostile
A White German Shepherd may be right for you.