DoggieLawn Dog Potty Kit - Real Grass & Tray - X-Large 24x48 inches Potty solution kit featuring our large Full Sized Fido size grass AND our plastic potty. tray. Easy to use solution with real grass which your dog already knows how to use! Just lay the grass in the tray. Replace the grass every so often depending on your dog's preference and usage. Little to no odor with our hydroponically grown grass as compared to typical sod.