A cat past 11 years old needs the house changed in centimeters, not in rooms. A 15-20 cm step instead of a 45 cm jump, a litter box cut down to a 5 cm front edge, one more water bowl than there are cats, and a light left on from 22:00 to 06:00 cover most of what arthritis and dim eyesight take away. Budget 300-600 RMB and two weekends.
Place the cat on the age curve before buying anything. A 12-year-old is about 64 in human years on the cat age chart, and roughly 9 in 10 cats over 12 show degenerative joint disease on x-ray. Owners notice the change 6-12 months late, because a cat with sore hips does not limp. It shortens the jump, then stops taking it, then stops climbing the cat tree, and those are three separate stages you only see if you are measuring height instead of watching for a limp.
Why 15-20 cm is the number
A healthy adult cat clears 150 cm vertically without visible effort. A 13-year-old with sore hips often refuses anything above 40 cm, and a cat with advanced disease stops at 25 cm. That 25-to-150 cm gap is the entire design brief: wherever the original jump is 40 cm or more, insert a 15-20 cm intermediate surface, and the cat keeps the route without ever loading the joint at full extension.
Tread depth matters as much as rise. A 15-20 cm rise with a 20-25 cm tread lets the whole paw land; a 10-12 cm tread produces half-paw landings and falls, which is how a 12-year-old ends up with a bruised chin and a refusal to use the stairs at all. Three steps is the practical ceiling per flight: at 4-5 steps an arthritic cat starts skipping the middle one, and a skipped middle step is a 30 cm drop.
Stairs, ramps and the 20 degree rule
A sofa at 40-45 cm takes 3 steps; a bed at 55-60 cm takes 4-5. A ramp beats stairs for a cat that has stopped lifting its hind legs, but only under 20 degrees of slope and only with carpet on it; a bare 30-degree ramp is a slide with a 60 cm runout. Width 25 cm minimum, with a 2-3 cm lip on both sides so a hind paw cannot slip off the edge at 3 a.m.
Foam 3-step sets run 40-120 RMB and weigh 1-2 kg, which matters because a 1.5 kg step that slides on tile is worse than no step at all. Wooden 4-step units at 150-300 RMB last 5-10 years, but check the rise with a tape: catalog numbers are often 22-25 cm, above the range a 12-year-old will use.
The litter box: 5 cm front edge
Length first: 60 cm for an average 4-5 kg cat, about 1.5 times nose-to-tail-base length, with 40 cm width. Then the entry. A 15-20 cm wall on three sides with a 5 cm front edge lets a stiff cat walk in; a 15 cm lip on all four sides forces the front-paws-on-the-rim posture, and that posture held for 3-5 seconds before every visit is the earliest litter box sign of arthritis you will get.
Litter 3-4 cm deep, unscented, fine clumping; filling to 8-10 cm makes a stiff cat dig less and miss more. One box per cat plus one, at least one per floor, and the box on the same floor as the sleeping spot rather than 12 stairs away; the room-by-room layout matters as much as the count. Scoop twice a day, full change every 2-4 weeks, no lid, 3 m of clear sightline into the room so the cat is not ambushed on the way in.
Water: n+1 bowls, 2 metres apart
Two cats means three bowls, not two. Space them at least 2 m apart and 1-2 m from the food, because many cats will not drink beside food, and a bowl at the end of a quiet corridor gets used more than one next to a washing machine. Width 12-15 cm, filled to 3 cm below the rim so whiskers never touch ceramic. Refresh every 12 hours: a 4 kg cat drinks 100-150 ml a day, and a measured 10% drop over 24 hours is a call, not a wait-and-see.
A 1-2 W fountain is optional and helps maybe 1 cat in 3. If you add one, keep at least one still bowl, because some cats refuse moving water and others refuse still water.
Light, floor, warmth
Two or three plug-in LED night lights at 1-3 W, mounted 30-40 cm off the floor along the bed-to-box path, hold a 6 m route at 0.5-1 lux without lighting the room. Non-slip mats go at four spots: box exit, food bowl, top of the stairs, foot of the ramp. Pile under 5 mm with a rubber backing; a loose 3 mm bath mat slides further than bare tile.
Room temperature 20-24 Celsius, and a heated bed with a 35-38 Celsius surface, covered by a thin towel and checked for 15 minutes the first time. Raise food bowls 5-10 cm to cut neck extension for a cat with spondylosis; 5 cm is enough, while 15 cm forces a stretch most older cats will not hold for a 10 minute meal.
The numbers on one page
| Item | Senior spec | Signal you got it wrong | Cost |
|---|---|---|---|
| Step rise | 15-20 cm, tread 20-25 cm | cat jumps over the step to skip it | 40-120 RMB for 3 |
| Litter box front | 5 cm lip, 60 cm long | front paws parked on the rim 3-5 s | 0-200 RMB |
| Water points | n+1 (3 bowls for 2 cats) | intake under 100 ml/day at 4 kg | 30-90 RMB |
| Night lights | 2-3 at 1-3 W, 0.5-1 lux | meowing after 22:00, missed landings | 50-150 RMB |
| Non-slip mats | 4 spots, pile under 5 mm | slipping on the box exit tile | 60-200 RMB |
What a vet checks before you spend 600 RMB
Weigh the cat every 2 weeks: 0.2 kg on a 4 kg cat is 5% and worth a note. Then a mobility exam with video, hip and stifle x-rays at 200-500 RMB, systolic blood pressure (above 160 mmHg needs treatment), SDMA and T4, which together run 300-800 RMB. Pair this with the senior adjustment checklist. Pain control changes the house question: a cat started on meloxicam or gabapentin often uses 25 cm surfaces again within 2-4 weeks, so build the 15-20 cm route first and expect the cat to need less of it later.
Five things this weekend
- Measure every surface the cat jumps onto; anything at 40 cm or higher gets a 15-20 cm step.
- Cut the box front to 5 cm, or buy a 60 cm low-entry box for 80-200 RMB.
- Add one bowl, so n+1: 3 for 2 cats, 2 m apart, refilled every 12 hours.
- Two night lights at 1-3 W along the 6 m night path.
- Four mats, pile under 5 mm, at box exit, bowl, stair top and ramp foot.
Frequently asked
How do I know my senior cat needs steps rather than just being lazy?
Watch where it stops, not whether it limps. Measure the highest surface it still uses; if that number has dropped from 90 cm to 40 cm over 6 months, the joint is the reason. A 15-20 cm step at the 40 cm jump usually restores the route within 2-4 days, and a cat that takes the new step is not being lazy.
Is one litter box really enough for one cat if I scoop twice a day?
For a young cat on one floor, yes. For a cat over 11, the box count matters less than distance: one box per floor and one within 6 m of the sleeping spot. A senior cat that has to use 12 stairs at night will hold urine for 10-12 hours instead, which raises the risk of cystitis.
Do heated beds help arthritis or just make cats soft?
Warmth reduces morning stiffness in most arthritic cats, and a 35-38 Celsius surface for 20-30 minutes is the usual dose. Keep the pad covered with a thin towel, check for 15 minutes the first time, and pick a model with a chew-resistant cord. Heat treats comfort, not the joint, so pair it with a vet pain plan.