What size Porch Potty should I get for my pup?

While the Porch Potty has been tested to hold dogs up to 150 lbs (68 kg), we recommend using Porch Potty with dogs under 120 pounds (55 kg). The Small Porch Potty is for very small dogs, usually 20 lbs (10 kg) or less (although size is more important than weight in this case). You want your pup to be able to easily turn around on the grass, as circling is common pre-use behavior.