A common hidden stressor in multi-cat homes is resources clustered in one corner. When litter box, food and water sit together, a confident cat can guard the area and others quietly use it less. The result often shows up as inappropriate urination, reduced eating or hiding.
The usual litter box guideline is one per cat plus one, spread across rooms and routes rather than lined up on a balcony. Each box should be large enough for a full turn, in a quiet spot with an escape route, not a dead end with a single exit.
Food and water stations also need separation. Sharing one bowl can create speed mismatches and resource guarding. Place stations in different locations so every cat can eat and drink without being blocked.
Vertical space is an overlooked resource. Cat trees, window perches and high resting spots reduce ground-level conflict and give less confident cats somewhere to retreat and observe. Avoid routes with only one narrow doorway.
If persistent hiding, inappropriate urination, over-grooming or reduced intake appears, spread resources first and rule out medical causes. If it continues beyond two weeks, log when and where it happens and which cats are involved, then seek a behaviour consultant or veterinarian.
Image: two kittens resting together, by Irshath 25, CC0, Wikimedia Commons: https://commons.wikimedia.org/wiki/File:Two_cats_sitting_with_legs_crossed.jpg
