Replacement Matt link below 
PAC19-14321 PET LOO REPLACEMENT GRASS Small,M,L | PetsRUs (petsrusmalta.com)
 
The PetSafe Pet Loo Portable Indoor & Outdoor Dog Potty is your backyard in a box. Ideal for apartments or in times when you can’t just let your pet out, this system gives your dog, cat or other small pet a convenient and more comfortable alternative to potty pads. The top layer lets your pet feel the grass under his paws and allows urine to quickly drain through. The reinforced base has a slight angle so all urine collects into a removable waste bin for super easy clean-up. When you can’t bring your pet to the backyard, bring the backyard to your pet!
Key Benefits 
Convenient, portable pet toilet is great for use almost anywhere.
Ideal for training or when you can’t take your pet outside to use the bathroom.
Feels like real grass under your pet’s paws for a comfortable potty experience.
Reinforced base easily supports your pet’s weight and gives ample room.
Removable container makes for easy clean-up—just wipe with warm water.