Space matters
The cat needs enough room to enter, turn and use the box comfortably.
Entry height matters
Kittens, older cats or pets with mobility issues may need easier access.
Covered vs open
Enclosures can contain litter but also change ventilation and access.
Health changes need veterinary attention
A sudden change in litter-box use can have medical or behavioural causes beyond the box itself.
General product-selection information only. A pet's health, anatomy, mobility, breathing and behaviour can change what equipment is appropriate. Follow product directions and ask a veterinarian or qualified animal-care professional when those issues matter.