A second Domestic Shorthair does not need a second home's worth of floor space, but she does need her own share of the resources cats will not happily queue for. Two shorthairs can share sofas, hallways and sunny patches all day, yet still fall out over a single litter box or one feeding corner. The extra space a second cat truly needs is measured in duplicated stations spread through the home rather than in added rooms.
Litter boxes: the one resource to over-provide
For two Domestic Shorthairs, three litter boxes is the working number — one per cat plus a spare. Place them in genuinely different spots, such as a bathroom corner, a quiet hallway end and a laundry area, never side by side in a row, because two boxes touching count as one location to a cat choosing where to go. A spare box in a second location is what prevents the guarding and ambush games that start when a bolder shorthair decides the single box sits in her territory. Boxes also need vertical thinking: a box on each floor of a two-storey home saves a cat from crossing the other cat's favourite room at the wrong moment.
Bowls, water and feeding separation for two shorthairs
Each Domestic Shorthair needs her own food bowl, and the two bowls belong in separate feeding spots rather than side by side on one mat. Shorthairs are usually easygoing eaters, which is exactly why a quiet resource problem hides easily: the slower cat simply eats less at a shared station and grazes later. Two water points in different rooms encourage drinking away from food, and a second set of bowls means one cat's meals can shift earlier or later without displacing the other. If one shorthair eats a different food, separate feeding spots also make closed doors and microchip feeders unnecessary in most homes.
Sleeping, scratching and vertical space to duplicate
A second Domestic Shorthair needs at least one more high retreat and one more low hiding spot than a single cat uses. Add a second scratching post near the second cat's preferred sleeping area, because scratching marks territory and a new cat with nowhere to scratch near her bed will use the sofa arm instead. Window perches, a cat tree with two levels that are not directly stacked, and a cardboard hideaway in a quiet room give each shorthair a place she can leave to when the other is in a playful mood. Retreats should sit in different rooms so neither cat has to pass the other to reach safety.
What does not need doubling
Two Domestic Shorthairs can share play sessions, one carrier each is still needed for vet trips, but toys, tunnels and climbing furniture are communal as long as duplicates exist for the items both cats love. Grooming tools are shared, though a soft brush per longhaired-leaning shorthair keeps loose hair sessions separate. Your weekly cleaning time roughly doubles at the litter boxes and barely changes elsewhere, which is where most owners overestimate the cost of a second cat. Watch for the real signals that resources are short: one cat waiting in doorways, meals eaten in a rush, or a cat suddenly choosing a laundry pile over a box.
Keeping two sets of stations straight is easier when the household works from one set of notes, and KinsLe Family Sharing lets everyone see each shorthair's feeding spot, box locations and preferences so the second cat's resources stay topped up rather than forgotten.