Just got a little puppy and the little guy will eventually have to ride in the M5. Anyone have suggestions for a washable rear seat cover?

This is one made for the E60, but it's a bit pricey.
http://www.irontoad.com/Merchant2/merchant...;Store_Code=BSC

Also, anyone have this dog harness?

http://bmw.autowebaccessories.com/store/bm...d1389_15737.php

Any other suggestions? Would prefer a cover that drapes over the rear footwells so he doesn't fall if I had to make a sudden stop :'(
Thanks!