My tricolor 3.5 year old female also has a few white hairs scattered among the black hairs. I wouldn't worry about it.
Nope, it happens. :-) Little anomalies like that happen everywhere on the dog's body, but it's obviously very easy when it's white on black!
I've seen this...the tri I saw had lots of white hair in her black...
Cowboy has some white right behind her legs. She's a BHT pem. Glad to know it's normal.
Hey, *I'm* getting white hairs, and in dog years, I'd be... let's see.... dead.