If you haven’t already, you will at some point in your design career be forced to composite hair or fur into a project. The specific reason isn’t important. But how are you going to do it? Use a plugin? Not any of the ones I’ve seen. Copy and paste hair from another image? Too much of a pain, what with the complex masking and color matching. So what will you do, paint the hair follicle by follicle? Absolutely. But it isn’t anywhere near as time-consuming as it sounds. With the tools available in the Photoshop 7 Paint Engine, you can generate hair and fur with as much detail as you like in almost no time at all. Link.
HOW TO add hair and fur to photos