From what I remember, and this is going back quite a few years, it also has something to do with having/not having pigment on the inside of the nose, inside the ear canals, etc. And yes, even one or two hairs of another color seems to preclude them. Barb Bowes Bo & Chelsea (Pyrs) & Flopsy (Pyrenean Shepherd) "The more people I meet, the more I like my dog!" bamb@monmouth.com