When you adopt a dog, his paperwork is his memory. He cannot tell your vet when he was last vaccinated, what food has suited him, or why he fears a particular sound, so the folder from his previous home — however untidy — is worth keeping whole until you have built a verified record of your own to stand beside it.
Keep it all first, sort it second
Resist the urge to bin tatty or confusing pages on day one. File everything you were given in the order it arrived: vaccination card or printouts, microchip number and database details, previous vet's name and any treatment summaries, diet and feeding routine notes, and written behaviour information. Add the adoption or rehoming agreement and the date he came to you, clearly marked, so later readers can separate his previous life from yours. If the rescue or owner gave information verbally — a sensitive stomach, a dislike of traffic, a sleep routine — write it down that day with the source noted, because spoken detail evaporates and later looks like your own guesswork.
Verify identity and transfer the chip promptly
The most time-sensitive page is the microchip. Check the number matches any vet record in the pack, then complete the transfer into your name, address and phone number with the database and keep the confirmation. Until that transfer lands, a finder who scans him may be directed to a previous owner who no longer has him. Register him with your chosen vet and take the whole folder to the first visit; the vet can judge which vaccinations are evidenced, which are claimed without paperwork, and what needs repeating or checking. Keep both the old claim and the vet's decision visible in the file rather than overwriting one with the other.
Handle gaps and contradictions honestly
Adopted dogs often arrive with partial histories: a vaccination mentioned but not stamped, an age that differs between two pages, a gap where a previous vet is unknown. Mark those gaps on a cover note instead of smoothing them away. A future vet, insurer or boarder is better served by an honest note saying an entry could not be verified than by a tidy file that pretends certainty. If the previous owner or rescue can still be contacted, ask once, promptly, for the missing clinic name or chip confirmation while they can still find it. Then close the question in the file either way, dated, so you do not keep chasing it.
Start your own section without erasing his
From adoption day, begin your own dated records behind a divider: your vet visits, weight, food as you feed it, training progress and behaviour in your home, which may differ from the notes you inherited. Keep the previous owner's section intact behind it. If he is ever rehomed again, or a vet needs his full timeline, that preserved history is a gift you can pass on because someone once kept it for you.
Treating inherited paperwork with that respect gives an adopted dog continuity instead of a blank page. With KinsLe Transferrable Profiles, his profile transfers to a new owner with history, records and routines intact, preserving what his previous home knew through every move that follows.