no, i don't and my brother is quite freaked out about this but it's fine cos he will then vacuum it very very cleanly for me if he ever needs to borrow my car ;0

i try to cover the seats when destination is known to be a bit dirty/muddy in case the dogs trek everything into my car.
every time i send my car for wash, the workers will tell me 'banyak rambut/bulu' and sometimes i cheekily tell them i have a 'mat salleh' friend who sheds mah! there is beige, white, black and brown hairs everywhere!

i warn my passengers when they come in but so far nobody has sneezed or complained. but woe betide the person who enters wearing black - habis covered with dog/cat hair!