we adopted salem and he's a HUGE cat.. not fat or heavy- just very long. I watched him in the litter box and he's so huge in there he barely had room to turn around. I started thinking about ways I could remedy this. I don't know that there are HUGE litter boxes you can buy, and there may be a better solution or something here on catster, but I came up with this:
in the garage we had 2 very large storage containers with lids that were holding our camping gear. I dumped that stuff out, cut 3/4 of the top off and viola! huge cat litter pan. It takes an entier box of litter at once, but I notice it stinking a lot less now with our 3 cats using it, and it's a lot easier to scoop up, and that whole 'pee on the actual bottom of the litter box' problem has cleared up.. I also refill much less frequently. yay!
i am IN LOVE with my new litter boxes. it works perfect for us. we keep the pans in closets without doors.. one is under the stairs, and one is in our bedroom. perfect!
we have a normal sized one in the laundry room also- just in case.