A terrier coat is something I have never dealt with before Zack and have come to learn that it is "different" to say the least. Luckily Zack's coat doesn't grow very fast as I have not plucked him since March but it certainly changes colours as it thickens up and starts to grow back in.
He has recently developed a red line down his back which is pretty cool
I wonder if the rest of him will turn red or whether the grey will cross over his back? Who knows.