You can buy shampoos that are specifically designed to thicken hair, such as this one: http://poiseandpurpose.com/blog/tlshair_sidebar/index.php?affid=370210&c1=TSI&c2=444 (although I think this is a tablet, so you might want to look up some shampoos)

Also, there are some hair-cutting tricks that can make your hair look thicker. Try some shampoos and talk to your hairdresser … Read more

Cats have special tongues that they lick them selves with. My cat is doing this right now and he is pretty clean and shiny. He doesn't smell or anything cuz he takes good care of himself and his appearance. So I don't think you are suppose to wash cats!! They just become miserable