A single weight written on a travel form tells a new vet almost nothing: not whether she has held steady for a year, gained slowly, or lost ground in the last month. Her dated series tells all three at a glance, which is why, before an international move, the history matters more than any one figure in it.
Prepare the Series as Evidence of Trend
Bring a running, dated record of her weights, always weighed on identical scales under identical conditions, so anyone can see at a glance which way the trend runs, fully up to date before departure. Add one final home weighing, done exactly as all the others were done, and mark it as the last home entry, so the destination vet can see exactly where the home series ends and the new series abroad will begin.
Write her method at the head of the series before you travel: the scales used, where they stand, how she is weighed, and when in her day it happens. Scales differ between countries and clinics, and a method note lets the destination vet judge how closely the first foreign weighing can be compared with the home figures instead of treating a scale change as a weight change.
Hand the Series to the Destination Vet in Person
Carry a paper copy in your hand luggage and a photographed copy on your phone, and hand the series over at her first appointment abroad rather than waiting for a problem. Walk the vet through where the trend has been heading: the long pattern, any recent change, and anything that explained a change at the time, such as a house move, a new food, or an illness recorded in her summaries.
Resist turning the conversation into a request for a goal figure set by the series. The series is evidence, and what a healthy weight is for her, in her new climate and routine, is a judgment for the destination vet who can examine her. Your contribution is the clean, dated, same-way evidence that makes that judgment possible from the first visit onward.
Keep the vet set separate from the travel documents. Paperwork a carrier or an authority asks to see serves the journey, with its own forms and deadlines, while her weight series serves her long-term care, and mixing the two piles is how a careful series ends up surrendered at a check-in desk. Carry the care set as your own property throughout, hand it to the destination vet in person, and take it home again afterward. If a practice abroad wants to keep a copy, give a copy and retain your original series, because the series only stays continuous while one owner keeps the master version. Photograph the finished series as well and keep the photographs with her summaries, so a lost folder never means a lost history at the border.
Continue the Same Series in the New Country
Keep weighing her the same way after the move wherever you reasonably can, and note beside the first entry abroad that the scales have changed, if they have. A noted change of scales preserves the honesty of the series; an unnoted one quietly corrupts it, and every later reader inherits the confusion.
Expect the stress and routine change of a move to show in the early entries, and read those entries with her settling notes beside them rather than in isolation. Her traveling series moves inside Pet Passport as dated trend evidence, and KinsLe keeps that evidence continuous from her last home weighing to her first one abroad.