John Gagnon says: This is an area that is management. You have a couple of options. First, you can get litter boxes that can’t be penetrated by the dog, like ones with covers or lids so that the dog can’t get in. Secondly, you can put the litter box in a garage. What I do with my own dogs is put the litter box in the garage with a cat door where the cat can go in and out of the garage, but the dogs can’t.
So again, preventative stuff. You can put the garbage underneath the sink, behind the cabinet, etc. I once had a dog that knew how to open cabinets so I had to put baby latches on the cabinets. It is a management thing. Keep the dog away from those items because the temptation is too high in your absence.