Hawthorn's dad, Pinyon, has a straight coat. Funny thing: Before I chose a puppy, I sent swabs to PawPrint, primarily to test for ICH carriers, but also asked for the test for straight/wavy/curly hair. All five pups, according to Paw Print, had straight hair. I've been meaning to send them a pic of Hawthorn's fur and suggest their hair test needs some, ahem, refinement!
This is dad Pinyon's coat, which is very straight: