Does anyone have a dog that uses them? I can just imagine the pups using it for digging in;)

I've seen a few toy breed dogs that were litter box trained, but I didn't know they had special "dog" litter boxes.

Yes, my ex-husband's grandmother has a dog that uses a litter box. I don't think the dog really goes outside too much. He's not a toy dog, but is smaller. I couldn't imagine having my 130 lb. baby using one, though! I've heard that a lot of people in big cities (like New York) litter train their dogs, which is probably very convenient living someplace like that.

My dog sometimes uses the rug as a litter box. ;)