Train your dog to do it's business on command, that's what I did , it works a treat. How! you might ask , well take the dog out when you know it should need to go and watch it closely, you can tell when they start going through the preliminaries, when it starts looking like it's about to go start repeating the command, I say look sharp, till its doing it , then praise while it's still in full flow. When it's finished give it a good fuss, do this for awhile, it will soon get the hang of it. Mine will try and go again strait after if I give the command, it's great last thing at night or for car