Oh I know what you mean- we also had the same problem. Generally, I don't think much about litter boxes. When we started to go out with Richie regularly it became just fine. But i know that sometimes people don't have another choice, because they are working and can't go out with their dogs. Just be patient- I read that it takes very long for small dogs learn this and a "smartest chihuahua will not get reliably housebroken until 1 year" ( I read this in a book). Good luck!
Richie's mom
Richie's mom