Changing practices is the one moment when a treatment record can quietly split in two, with the older half sitting in a filing system you no longer use and the newer half starting fresh somewhere else. Your cat's prevention history does not pause for the move, and a due date that falls in the gap between practices is the one most likely to be missed by everyone. The update you make now is therefore less about tidying and more about custody: one complete history, carried across, and read by the new practice before they decide anything about her future care.
The History That Has to Travel Intact
Start from your own record and make it complete before anything is sent anywhere. For each type of prevention, the record should show what was given, the date it was given, and the next due date, for flea prevention and for worming treatment alike, going back as far as your paperwork honestly reaches. Where an entry is thin, a nickname instead of a product name, a month with no day, go back to receipts, packaging, and the old practice's own file and repair it while you still have access to that file. Do not smooth over a genuine gap by inventing a date that looks tidy, because the new practice will plan around whatever you hand them, and an honest gap they can see is far safer than a neat date that is wrong. Note beside the history anything the entries alone will not tell them, such as a product she reacted badly to in the past or a treatment she will only accept in one form, since that context shapes what they suggest next.
Making the New Practice Confirm the Takeover
Ask the old practice to transfer the full history, and then treat the transfer as unfinished until the new practice confirms, in a conversation you actually have, that the history arrived and has been read. Reception of a file is not the same as a clinician reading it, so at the first appointment walk through the due dates together and ask the new vet to confirm which of them they will take over from here, and whether their own approach changes any of those dates going forward. Whatever they confirm becomes the new working version of the record, so update your own copy from that conversation on the same day rather than trusting yourself to remember which dates moved and which stayed. If the two practices disagree about a date, keep both versions visible with a note explaining the difference until one practice takes clear ownership of it, because a silent overwrite is how a cat ends up treated twice or not at all.
Your Copy Is the One Constant
Practices merge, software changes, and files that were promised do not always arrive, which is why the owner's copy matters more during a change of vets than at any other time. Keep the refreshed history with the rest of her records rather than in a separate folder marked for the move, and check it again a few weeks after the switch, when the first appointment under the new practice has added its own entries and any transfer problems have had time to surface. Read back the next due date for each type of prevention at that point and make sure your copy, the new practice's file, and your calendar all say the same thing. Once they agree, the change of vets is genuinely finished rather than merely intended, and future readers, from a sitter to a cattery, inherit one history instead of two partial ones. Holding that single history inside Pet Passport, the records packet KinsLe provides for exactly these handover moments, means the next move starts from your copy rather than from someone else's filing.