Black dogs sometimes turn rusty brown.  People tend to attribute this to “too much sun” but, indeed, some black dogs never turn brown, while some others are brownish all year round, winters included.  I owned a black dog only for a couple of months: he was a rescued Greyhound and he was, indeed, brown but this was caused by severe anemia and leishmaniasis.  We all known systemic diseases can affect coat colour, but nutrition can as well. Yesterday, my friend Lucia Casini, who is professor of Veterinary Nutrition at the University of Pisa, shared this study with me “Tyrosine supplementation and hair coat pigmentation in puppies with black coats –…