White dogs (with white skin...not white dogs with pink or dark skin) are unhealthy mutations. You should never encourage someone breeding them on purpose. These dogs frequently suffer their whole lives. They have skin problems (dryness, flaking, infections, sunburn), eye problems (sun sensitivity, blindness, infections, malformations), emotional problems (obsessive/compulsive behavior, unreasonable aggression), and a host of internal problems (circulatory disorders, deafness, muscular deficiencies, liver disorders). These dogs should be taken care of and loved just as every dog had the right to be taken care of and loved, but no one should encourage the practice of breeding unhealthy animals for profit.
I had a white Dobie and from the day she was 10 weeks old, she struggled through cancer, deafness, a herniated stomach, degeneration of her muscle tissues, and a number of other problems. She cost a fortune to keep. She couldn't leave the house without sunblock and dark doggy goggles. Of course I thought she was the most beautiful animal on earth, but I think that of all my pets. I turned her over to a wonderful family when she was 2 years old, and they diligently cared for her until she died of cancer at 5. She was a beautiful soul trapped in a miserably unhealthy body. What broke my heart was watching her trying her hardest to be a normal dog and not being able to do the things she loved. Tell your friend to think again before she buys the puppy and encourages the breeder to keep producing them.