One Log, Written the Same Way in Both Homes
A joint care log fails when each home keeps its own version. Choose a single shared log and agree a short entry format before you start: date and time, which home the cat is in, and the same mobility observations every time. Two households describing stiffness differently — one writing 'a bit slow' and the other 'fine today' for identical mornings — makes trends impossible to read, so agree plain shared phrases for waking stiffness, willingness to jump, stair use and ease getting into the litter tray.
Record handover days twice: the home she leaves notes how she was that morning, and the receiving home notes how she travelled, settled and moved that evening. Travel itself, a different carrier routine or a longer car ride can leave a cat stiff the next day, and without both entries that dip looks mysterious.
What to Observe for Joints Specifically
Watch the first ten minutes after she wakes, when stiffness shows most honestly. Note whether she stretches fully, hesitates before jumping onto a sofa or bed, uses a step or ramp if one is provided, or chooses lower resting spots than usual. Record litter tray access carefully: a high-sided tray she stops using cleanly may be a joint problem disguised as a behaviour problem, and that detail belongs in the log in those words.
Add appetite, grooming reach — whether she can still groom her back and hindquarters — play interest and sleep position. Note what seemed to help that day: a warmer room, a low heat pad designed for pets used under supervision, gentle short play sessions rather than one long chase, or a quiet day after visitors. You are logging observations and comfort, not diagnosing a condition or adjusting any treatment your vet has set.
Make Both Homes Tell You the Truth
Set up each home to match where you can: a low-entry litter tray in both, a step up to favourite sleeping spots in both, food and water reachable without stairs in both. Then log where the setups still differ — slippery hallway flooring in one home, a favourite windowsill that requires a big jump in the other. If the log shows worse mornings consistently after nights in one home, those differences are your first suspects, ahead of any change in her condition.
Keep essentials duplicated rather than carried back and forth: the same style of tray, familiar bedding that smells of her, and her usual food in both kitchens. A cat stressed by change moves less and hides more, and stress can be misread as joint decline unless the log also records how settled she seemed.
Sharing Vet Guidance Without Chinese Whispers
After any vet visit, whoever attended writes the guidance into the log that same day in the vet's own terms: weight recorded, what activity was encouraged or limited, what signs should trigger a call, and when to return. Both households then work from that written entry, not from a remembered summary passed on in a hallway conversation.
Flag disagreements in the log instead of smoothing them over. If one home thinks she is coping with stairs and the other has logged three hesitations in a week, the entries themselves start the conversation, and the vet can be shown both views at the next visit.
Review It Together Every Week
Pick a short weekly moment to read the week side by side and add one joint note: better, worse or unchanged, and what you will adjust next — a ramp moved, a tray swapped, play shortened. Weight deserves its own monthly line taken the same way in whichever home she is in, because extra weight loads sore joints and gradual gain is easy for two households, each feeding generously, to miss.
When both homes update the same cat profile through KinsLe Family Sharing, each entry lands in one shared history, so neither household ever has to ask the other what the vet said or how last week went.