i have a 7 month old deerhound x who is in great condition but seems to have some sort or dandruff or something when i brush back long hair there is a layer of short thick hair like cotton wool or something and there is white flakes there and its starting to move down his back ( its between his shoulder blades at the moment).. its not very bad but i would rather he didnt have it..he is sleeping on rubber matting with another shorthaired dog who is fine.. is it just the deerhound in him or is it a condition of some sort.. any info would be appriecated thanks..