Striped nails?

[J and Riley (and Luna)]

So I've been wondering at this for a while...Does anyone else's doodle have striped nails?

Luna has mostly white nails, but the tops of most of them have a "racing stripe" of black right down the middle from the base all the way to the tip.

These are the best pictures I could take - the 3rd picture tells most of the reason why... the rest of my excuse is that my camera is terrible (especially at closeups!)  I'll try again in the morning with some natural light.

[Susan, Zeke. Lily & Jasper]

My Lily has a few striped nails!  She is a cream colored labradoodle.

 

[Terrlyn]

Hurley has this too, I often wondered what it was as well.