Me and my husband have our two cats leash trained. We do tether them up outside but we dont leave them out there alone. We watch them very closely. What we now want to do is train them to deficate outside so they dont need to use the litter tray as much when they are indoors. We wont stop them using the litter tray when they are in. We just dont want them to be dependant on the tray when they have the opertunity in the day to be outside on their tether and go. Is there a way they could be trained to do it?