I have a 12 year old JRT cross who's left at home alone 4 days a week whilst I go out to work. Until a few months ago everything was fine but since then he's started peeing in the house. He never does it when I'm with him. Apart from this he's a happy active little dog with no other behavioural issues. I know it could be down to any number of things but would like to find a solution. I know it's not ideal leaving him on his own for this long and I have tried popping home at lunchtime but he still pees when I'm not there.
One idea is to bring him to work (I work 9-5) and leave him in the car (obviously only when temperatures aren't too high/low). This is a private work car-park and I can see it from my window (it would take less than a minute to reach my car). I'd go out and check on him on an hourly basis, make a fuss of him and take him for a walk at lunchtime. He sleeps a lot now anyway so instead of snoozing on the sofa, he'd be in his bed on the back seat of the car. Is this as a really bad idea?