What the best kind of stuff to use to landscape a small fenced in patio that my dog sometimes uses?

Answer 1

cedar mulch. Ceder helps absorbs any smell and deters insects.

Answer 2

Stuff? Be more specific please. Building material, plants, groundcover.........what??

If you are worried about toxic plants, here's one of many sites listing potential problems:

http://www.cybercanine.com/toxicplants.htm