Question

Which one of the following would be the best type for training with a litter box

Answer 1

I don't know if dogs can be trained to use a litter box.

Answer 2

Even if they can, from the choices you list, I'd say none apply.

Answer 3

Apparently some people train dogs to use a litter box.

http://www.google.com/#q=dogs+litter+box+training