I have a 5mths old puppy and he is a very good pup in general but we have noticed that over the last week he is pee'in indoors again and it seems to be at times when we aren't giving him 100% attention, i.e. when I'm brushing my teeth or cooking / putting away food in the kitchen! Is there any way we can stop this, he hasn't been getting any attention for doing it, we are doing what we did when we started to house train - putting him straight outside while we clean up and then leaving him there for 5mins or so. Any advice would be greatly appreciated...