I always had to keep Annie's mustache trimmed short because her tongue was constantly dragging her hair into her mouth. I kept the hair on the bridge of her nose short, too.
Boo has semi-long hair on his nose. His just seems to not grow so fast as to ever need a trim.
Gracie's hair just goes wildly everywhere right now.

I'm looking forward to her puppy hair quieting down and behave itself. However, I'm starting to think it's never going to behave like a proper mustache I think it's influenced
a lot by her personality.
1) Annie
2) Boo
3) Gracie