You should only be leaving your dog for 4 hours at a time, with my staff we have a dog walker that comes half way through the day for an hour to break the day up, we leave kongs with treats in to keep her occupied and we recently bought an adaptil plug in which really helped, she hasn’t had an accident for as long as I can remember. It is usually due to seperation anxiety, I would suggest a dog walker or sitter to break the day up and definitely try the Adaptil plug in