Since 2009, almost all of the larger size Pet Patio Potties™ have been made with double-sized trays when K9Grass™ was selected as the surface material. These potties have one, two, three or four trays respectively for Small, Medium, Large and Extra Large size units. Each double-sized tray requires one double-sized piece of K9Grass™. The approximate physical dimensions of a double size piece of K9Grass™ are 34.5" by 16.25".
- Each Small size Pet Patio Potty™ requires 1 Double Size piece of K9Grass™
- Each Medium size Pet Patio Potty™ requires 2 Double Size pieces of K9Grass™
- Each Large size Pet Patio Potty™ requires 3 Double Size pieces of K9Grass™
- Each Extra Large size Pet Patio Potty™ requires 4 Double Size pieces of K9Grass™