I trained my little poodle to use a litter box with dog litter and it works great,
when I got my yorkie I wanted him to use a litter box as well, he is a stubborn little fella and would have nothing to do with it, he goes outside most of the time but needs something if I'm out for a while. He will use a pee pad with the holder, so I am using both the litter box and the pee pads, I must tell you the litter is much cleaner, and goes much further, if I had my druthers and the cooperation of the one I'm training I would choose the litter box with the purina dog litter.
Good luck whatever u decide.
