A dog and a cat can share a house comfortably, but they experience the same rooms very differently. Your dog moves through the home as a series of interesting places to be; your cat reads it as a network of safe and unsafe territory, and a room with one doorway is a trap if the dog is standing in it. Setting the house up well means designing for the cat's sense of escape first, then teaching the dog that those escape routes are simply part of how the house works.
Think in routes, not just rooms
Walk each room and ask one question from cat height: if the dog walked in now, where would the cat go? A good room offers at least two exits — perhaps the doorway plus a cat flap in an internal door, a gap behind the sofa that leads to the hall, or a shelf route that crosses the room above dog height and lands beside another door.
Give the cat height and the dog a settle place
Vertical territory is the cat's motorway system. A tall cat tree near a window, shelves stepping up a wall, or the cleared top of a wardrobe lets her cross, rest and observe entirely above the dog's world, and cats who can watch a dog from height usually relax about him far sooner than cats who only meet him face to face. Balance that with a defined settle place for the dog in the shared rooms — a bed or mat where he is rewarded for lying calmly while the cat moves around. His job in shared spaces is this settle, practised first when the cat is elsewhere, then for short, rewarded stretches while she uses her high routes in the same room.
Doors, gates and gaps that let the cat slip away
The most useful hardware in a mixed house is unglamorous: baby gates the cat can jump or slip through but the dog cannot follow, doors held a cat-width ajar with door straps or wedges, and a cat flap into one entirely dog-free room. Choose one room — often a bedroom or spare room — that is always the cat's sanctuary, containing a bed, water and a litter tray, where the dog is never allowed, even when the cat is not in it.
Protect food, litter and undisturbed rest
Feed the cat where the dog cannot reach — on a raised surface he cannot access, behind the gate of the sanctuary room, or in scheduled meals rather than food left down — because a dog who raids the cat's bowl creates conflict at exactly the place she needs to feel safest. Litter trays belong in quiet, dog-free spots with a clear approach the cat can check before she commits; a dog who ambushes, even playfully, at the litter tray will create a cat who stops using it.
Introduce the layout in stages and watch honestly
Open the new routes and zones before you expect them to be used calmly. Let the cat explore the shelves, gates and sanctuary with the dog shut out, until she uses them as ordinary furniture rather than emergency exits. Then allow shared time in one room, dog settled on his mat with rewards, cat free to use every route, and end the session while it is still relaxed. If chasing happens, go back a stage and add management, because rehearsed chasing quickly becomes a habit for the dog and a lasting fear for the cat. Drawing the zones, sanctuary rules and which doors stay ajar into KinsLe with Family Sharing means visitors, teenagers and pet sitters all keep the same routes open instead of accidentally shutting the cat's escape away.