Nasal Depigmentation in Foxes (Snow Nose or Dudley Nose) Nasal depigmentation is a condition in which there is little known. It is a superficial skin complaint that doesn't cause health issues and is often recorded in dogs. Most often, there is no known cause and the condition is generally considered idiopathic, but autoimmune conditions such as lupus, parasitic infections such as leishmaniasis and genetic conditions such as vitiligo can sometimes be behind it. The condition can be temporary or permanent, but usually causes no serious health issues. In dogs, the condition is often associated with animals that carry the recessive red gene and those with the liver colouration. Photos by Joe Branco, Tejas Prints, Brandon Lord and Kat Gunn blackfoxes.co.uk