Don't worry, this isn't a disease or ailment, it just affects the pigment and the hue you see. For most involved pooches, it's a pink-to-light-brown stripe in the center of the nose while the edges remain black. While some people believe it's purely snow related, cases of this seasonal condition in warmer climates show that it is most likely also caused by shorter daylight months, not the cold, wet stuff itself.
Older pups often keep this lighter color year-round as they age— have you spotted anything like it with your furry friends?
Source: Flickr User Shmoomeema