How do i stop my dog pooing in the house and get him to use the garden?

Try using a cage, when you're not training, playing or taking him out to go toilet keep him in this cage and have his bed in there (dogs dont soil their beds), keep a schedule of when you take him out, when you feed him, when you train him and when you play with him and when you put him in the cage (when you're not watching him) hope this helps:)