Mate, we had trouble with our JRT and lakey cross as pups, so bought one of those wee cages and lined it with paper, fair enought they still did a mess in a corner but then we started to leave the door open, so they could wonder onto paper in the kitchen, and they started to use the same area in kitchen ,until they where house trained, didnt take all that long, if you can leave the back door open after you have had in him out at9pm for a bit this way he can wonder in and out .Any chance you can send some photos of your pup as the wife loves these wee dogs, am still looking for one.       cheer