Well...we have three cats and, now, 6 yorkies. There are occasionally issues with them trying to eat cat litter, their food, etc. but they can be easily worked out.
Those automatic litter boxes work wonders...they're expensive but worth every penny. BUT for just a simple litter box you can put it up high where layla can't reach it, put a gate into the room where the litter box is (the cat can jump in, dog can't), put his box down into something like a large moving box, etc. OR simply just have a room sectioned off for him where he is put in when you leave or at night, and open the door for him to go in every 6 hours or so to potty. That's also a good opportunity to feed him. We feed ours twice a day, overweight cats can be very unhealthy...it's even more dangerous than with dogs. Ours get food AM and PM before bedtime. They ALWAYS clear their bowls, but if he doesn't (which he may not if he's used to free feeding) then still take it away and don't feed again until dinner/nighttime. He'll be hungry and eat the whole thing that time...and will eventually get used to it. Cats are much more low maintenence than dogs really, they're pretty easy to take care of...as long as he has a place to lounge in the sun, food, water, and a litterbox he'll be fine...lol. I know LOTS about cats as all three of ours are shelter cats...and I used to volunteer at the animal shelters a lot...plus I've had cats allll my life. So just let me know if you have any other questions or if something doesn't make sense...
