reposted in its' entirety with permission..... I have also contacted the AVMA to see if I can the official opinion pertaining to Sphynx and dyeing.

Best Answer - Chosen by Asker

The web site, groomer to groomer, interviewed professional dog groomers about coloring pet fur. One recommends a "semi-permanent product called Punky Color." Unsweetened Kool-Aid is another possibility, but, apparently, it washes out as soon as the dog gets wet.

Hair stylist Max Maddux agrees that only white dogs should be given dye jobs. Apparently, the dye doesn't work as well with darker pets. He recommends the brands Pravana, ManicPanic, Punky Color.

Of course, that's no guarantee the dog will like the dye job. Also, it's smart to check with your vet before you do the dying. Some dyes can be harmful and may hurt the dog.

good luck,

Mike

Source(s):
http://groomertogroomer.com/gtg_22_8.htm...
http://www.maxmaddux.com/stevecolor.htm...