The small dog potty box is perfect for small breed dogs that weigh less than 12 lb.
The large dog potty box can is ideal for dogs over 12 lb. and up to 80 lb.
Are large dog potty box is the most popular choice because it allow dogs room to move around on it before they to there business.
Dogs find it much easier to use when they have a bit of room to move. When you walk your dog it is the same thing. They don’t usually pick the first spot they arrive at.