A common condition in many golden retrievers and yellow Labs with black skin pigment is the phenomenon known as “snow nose” or “winter nose.”
A black nosed dog’s nose suddenly turns brown. In golden retrievers, one expects a panic, because brown skin isn’t supposed to exist our breed! (It actually does, but it’s quite uncommon to see a golden with a brown skin and the features of a liver or chocolate dog).
The truth is that goldens and black nosed labs, along with Siberian huskies and malamutes, are prone to having their noses turn brown in the winter time.
Don’t worry, golden owners. Your dogs’ nose will usually turn back to black by summer time. Very old goldens often develop permanently brown noses, though, but this condition I’m describing here is only temporary.