What do you feed the dog? Canned food has a high water content. After about 3 PM, only feed dry kibble if you aren't already.

What about the water dish? Is it always available? Maybe take that up at about 8 PM, or 2 hours before you go to bed. Remember to make water available again immediately in the morning when you get up.

Then take the dog out one last time before you go to bed.

These suggestions may help. Good luck.