Are humans the only animals that get gray hair at old age?

Everyone knows that when we (a.k.a. apes) reach old age, we get gray hair.





But how about other mammals and nonhuman primates? Some examples are chimps, monkeys, gorillas, and dogs.Are humans the only animals that get gray hair at old age?
No, many species go grey with age. Just look at an elderly dog - they're often grey about the muzzle, like this:


http://dazedmom.files.wordpress.com/2009鈥?/a>Are humans the only animals that get gray hair at old age?
Cats can have white hair instead of black as they age.





http://www.cats.com/question/breeds/gene鈥?/a>
Yes animals like dogs and cats and other mamals get gray hair. I used to volunteer at a vets office and the older the animal the grayer it's hair was.
dogs get grey around their muzzle.. cats too..





horses - grey horses are born solid colors but turn grey at different rates - some appear pure white as early as age 3 yrs.. others turn grey slowly and are not even pure white at age 10.
I've seen apes (chimps, gorillas) and dogs with gray hair when they were older.