CITY DWELLING DOG PARENTS! This thing is super.

It's basically a doggy litter-box...
and for those of you with stubborn little dogs who pee on things,
this is a god-send.

http://www.petapotty.com/flashsite/originalstore.html

"It measures 34" x 34" x 6" and can take toy, medium, and most larger sized dogs. This was our first luxury product and continues to be the favorite among two+ dog households or spaces. The Original PETaPOTTY is our top of the line product. Just short of 3' by 3'. This unit features a concealed trap pan that allows for the collection of water and your pet's urine. The trap pan is easily accesible, which allows for no hassle cleaning. The Original PETaPOTTY is perfect for any size dog (110lbs or less) you may have."