Two homes quietly break a schedule built for one
Preventive care runs on reminders, and reminders live in places: the clinic near home sends the vaccination card, the parasite prevention sits in one kitchen drawer, the annual examination belongs to the practice you have used for years. Move seasonally and every one of those anchors splits. An item falls due during the months at the other house, its reminder goes to an address you are not at, and by the time you return it is months overdue and nobody — not you, not either clinic — saw the gap happen. The fix is to stop letting either house own the schedule and give it to the cat instead.
Build one master schedule that travels with her
List every recurring element of her preventive care in a single place: her examinations, each vaccination, and her parasite prevention, each with the window in which it next falls due rather than a single fragile date. Then lay your own calendar over it — where will you actually be living when each window opens? That one exercise, done once, exposes the collisions: the booster that lands mid-season at the far house, the prevention rounds that span the move itself. Decide for each item, in advance, which home and which clinic will handle it, so nothing is left to be improvised in a busy moving week when her care is easiest to drop.
Choose a lead vet, and make sure both clinics know the pattern
Two practices can share a patient well if one of them clearly holds the complete record. Pick the clinic you regard as her main vet — usually the one you have the longer history with — and ask them to keep the master file, with the other practice sending notes of anything they do back to it, or to you to pass on. Tell both clinics plainly that she lives between two homes, and ask each what they need from the other to treat her safely: vaccination proof, prevention history, notes from her last examination. A clinic that knows a second practice is involved will write its records differently — more completely — than one assuming it holds the whole story.
Handle the move itself as a preventive-care event
Travel weeks are when prevention lapses, so build her into the moving checklist alongside the mail redirection. Pack her prevention supplies in her own bag rather than a general box, so a round due in moving week still happens on time. If a due date falls close to a move, ask her lead vet whether it is better done just before leaving or just after arriving, and follow that rather than letting it slide by default. Register with the second-home clinic before you need them — a leisurely registration visit in your first week beats a first meeting during an emergency, and it gives them her records while everyone is calm.
Different places bring different risks — ask, do not assume
Two homes can mean two parasite seasons, different local disease pressures, and different rules about what a boarding facility or groomer in each place requires. At each seasonal arrival, a short check-in with the local clinic — what is active here now, does her current prevention still fit — keeps her plan matched to where she actually is rather than where she was. Keep every update written into the master schedule as you go, and storing the schedule with her vaccination and examination records in her Pet Passport on KinsLe means that at either home, with either clinic, you can produce her complete preventive history from one packet instead of reconstructing it from two houses' paperwork.