We got the 24”x24” for our corgi and I’m glad we didn’t get anything smaller. I’m glad I finally found a product like this! In the past, I’ve thought about purchasing artificial grass potty pads but the idea of having to clean urine and feces off of fake grass grossed me out so I’m glad to have found REAL grass that is dirt free that I can just replace every month!! It’s great having something like this for people that live in high rise buildings with dogs, also great for unfriendly dogs that want to fight every other dog they run into. Also- since it’s on a tray, you can bring it inside the house for a while if you plan on being gone longer than usual in case you can’t get home in time to take your pup out. Love this. Glad we found it! Would love to see a better free tray sent with new subscriptions. The one I got was very flimsy. It was also nice to get pheromone spray with the welcome kit along with potty bags, treats, and gloves for when it’s time to dispose of the used grass.