What about shifting the dog's location to the now unused basement?

I think it would be nifty if you closed in below that "counter, open below" area to the right (to the left facing it) of the W/D.

Have a pretty standard base cabinet swinging door with a kitty hole cut in it.

I wouldnt want to lose any of that nice locker space you have; and the pantry should be a LAST resort... I wouldnt want my cats in the pantry, but I tend to believe they are stinkier than average ;)

I like the idea of tucking it under the lockers. Is there meant to be a "seat" there with cubbies above? If so, a simple flip-up seat and a kitty-sized opening in the front panel should do the trick.

And I know you didn't ask, but would you consider moving the pantry door to the back hall? You're having to go through a lot of doors to get to your pantry. Or at least consider a pocket door.

I'm with Vt remodeler on the location for kitty litter, and with jakabedy for a change of pantry door. At least maybe reverse the swing? Changing it to the back hall might be best, but as it is, you have to step into the laundry area to get into it.

I would replace the pantry with a dedicated cat closet with a smaller footprint. I don't like to have litter boxes in any living spaces. I would even consider a small closet attached to the exterior of the house with pet door access.

One word of caution. Some cats won't use enclosed litterboxes. Believe me, you'll find out whether or not your cat tolerates it. As cat lovers know, some cats aren't fussy, while others are. The "outhouse" effect drove one of my cats to pee outside the enclosed litterbox after never doing such a thing, while my other cat didn't mind in the least. I'm not saying it won't work, only that it might not. Reading the mind of a cat is tough---but they're wonderful!

Basement with a pet door in the the larger people door.

My cats box is in the laundry room. My dog use dto help himself to the contents- blech. Now you know that boy was not allowed to give kisses. Anyway, back to topic- cut a small cat sized hole in the bottom of laundry door. Easily replaced when moving.

I too have a cat door cut into the basement laundry room. Overall, that works for me and the five cats as well as the dog. My only ongoing concern is that the 10 x12' room also houses the forced air gas furnace and it is said that the off-fumes from the cat litter will shorten the life of the motor.