Copy the bottles, do not paraphrase them
The one rule that makes a travel medication list trustworthy is that it is a copy, not a summary. Owners get into trouble by translating labels into their own shorthand: a name shortened the way the family says it, directions compressed into a phrase that means something slightly different, a strength dropped because everyone at home knows which bottle is which. Away from home, nobody knows which bottle is which, and a sitter, kennel nurse, or emergency vet reading your shorthand has to guess at exactly the points where guessing is unsafe.
Sit with the actual bottles and transcribe each label as printed: the medicine name in full, the strength exactly as it appears, the directions exactly as written, the prescribing clinic, and the dispensing date. If a label carries a warning or a with-food instruction, that line travels onto the list too.
Building the travel copy
Give each medicine its own block on the list, in the same order the bottles sit in your travel kit, so a reader can match list to bottles by position as well as by name. Under each block, add the practical travel facts the label does not carry: what time of day the medicine is given in your routine, what you give it with, and what your vet has told you to do if a dose is refused or a dose is missed, agreed before the trip rather than improvised during it. Keep those additions visibly separate from the transcribed label text, so nobody mistakes your household notes for the clinic's directions.
Finish the list with the contacts that make it usable: your own vet's number, the clinic that prescribed each medicine if different, and your contact details as the owner. A list found in a bag by a stranger should lead them to a person, not just describe bottles.
Packing the list with the bottles
Keep one copy of the list inside the medication kit itself, traveling with the bottles it describes, and one copy with your dog's other travel papers. Photograph each bottle label as a backup; if the list is ever questioned, the photograph settles in seconds what the bottle actually says. Travel with medicines in their original labeled bottles rather than decanted into plain containers, because the bottle is the primary document and the list is its checked companion.
Check the kit before every trip, not once a year. Confirm each bottle on the list is present, each bottle in the kit is on the list, and nothing has passed the date printed on its label. Trips have a way of surfacing a bottle added by a recent vet visit that never made it onto the list, and the kerbside check is the moment to catch it.
Updating the list when a label changes
The list goes stale at predictable moments: a medicine is stopped, a strength changes, a new bottle replaces an old one with slightly different wording. Treat any change from the vet as a list change the same day. Cross nothing out and overwrite nothing; produce a fresh copy from the current bottles, check it character by character, and discard the old copy completely, because two versions of a medication list in circulation is worse than one slightly dog-eared original.
Storing the current checked list in your KinsLe Pet Passport with his vaccination and health records means whoever needs it on a trip, from a boarding kennel to an unfamiliar emergency clinic, reads label-accurate information instead of a summary written from memory.