I think it would be much much too work to do total new lines, and I can see people getting mad about graying muzzles in older dogs, and having to freeze the dog or rewind it's age to reverse it<br /> <br /> With new lines, the artists have to sketch up the dog, line it, do all base colours, all white + tan markings, all secondary markings, all eye colours (of every breed and every image like cropped + docked, etc and puppies) and then have to fit all the items to the adult and (in some cases) puppy images.