My first thought was also snow nose...but when you said that the breeder lists them as 2 different colors, I wonder if the pup is parti or mismarked? If so, that could explain the two colors. For instance, I have black puppies with white on their chins, chests and toes...the ones with white on their toes have black claws where their coat is black and white claws where their coat is white.
So...is this "snow nose"?
One of Tuesdays pups had pink around the top edge....
First picture shows her at about 6-7 wks. old, 2nd pic @ 6 months.
The yellow lab is her gramma....she has it too. It is not a clear cut "pied" look....more like a skinned knee(or nose) look.
My girl Copper has a pinkish tint on her nose and I think she always has. HOWEVER she has black lips and eyelids, and so her nose's color is somewhat irregular. I'll let you know if it ever goes all the way to black; we got her in August and the winter pictures showed the pink nose, and honestly, I didn't notice or remember if her nose was black last summer.
MEANWHILE, here's a legitimate assortment:
Brandi is a CARAMEL puppy, with a liver nose:
And NICK is a dark apricot with a black nose. I suppose his nose could go rosy in the winter but his eyelids and lips are black.
I think the snow nose phenomenon is separate from the dilute gene and I have only seen it in YELLOW Labs/Doodles. I have and have had several diluted dogs and no sign of noses changing color.
Personally I do like it tho - like I like white spots on the muzzle and chin because I think it's a fun look! And if a dog legitimately has liver nose, and lips and eyelids it means something different for a breeder.