hey, i have a question i want to ask your advice on..my rocky is 15 weeks old, and you can clearly tell where his "mature coat" (i guess that's what you'd call it) is coming in..it started as just a 2" wide line along his backbone, and has gotten wider and thicker over the past few weeks. anyways, along his back now, his hair has gotten VERY wavy and i brush it about every other day to try to train it, but it seems as if it doesn't help at all. i'm using a Furminator brush. do you think as he gets bigger his skin will stretch and make the hair straight? or do you think it's just a genetic defect and i'm stuck with a wavy haired rotti? also, there's some gray hairs in his mature coat, is that something else to worry about?