The only litter box one of my cats will use correctly!
We adopted a re-homed ragdoll female cat five years ago. She's been an absolute nightmare with toiletting since we had her. She pees upwards and over the edge of pretty much every litter box I bought (that's at least 5 before this one) I tried a top entry one where there was nowhere for to pee over, but she wouldn't use it, nor what looked like a smaller version of this. FINALLY, she uses this one (as long as we remove the door) can't pee out and it's big and sturdy enough.