The Hubby has installed cat flaps in multiple places around our old house, to give Angel and Chuck access to rooms that we humans close up. These images are from the once-porch-now-family room, leading into the dining area. In the winter, this family room acts as a air lock, keeping the cold out of the main house. The family room also is a bit of a storage area, but every window has a set up so the cats can look out comfortably.
Although I refrain from showing photos of litter boxes, you are looking at one here. Notice the puppy pee pads taped to the knotty pine paneling, due to Chuck's insistence that he stand UP halfway through urination. He does not do this every time, nor every day...but often enough that we need to preserve the house! We believe this is a symptom of his constipation, or he may be getting arthritic. We have a holistic vet visit scheduled for this coming Saturday; this is one item on my list to discuss with Dr. Sheppard.