Splitting dogs between a friend's spare room and a boarding kennel sounds like one holiday problem, but it is two different care arrangements running at once, and each carer needs a complete file for the dogs in front of them — not a share of one bundle. The friend cannot use the vaccination certificate that travelled to the kennel, and the kennel does not need your friend's feeding notes. Duplicate deliberately, by dog and by destination, before the day everyone leaves.
Build one master file per dog first
Start from a clean master for each dog: identity and photo, microchip number, your contacts and an emergency contact, vet details, vaccination record, any health conditions with their daily care, feeding instructions and routine. Work from these masters and print or copy from them, because duplicating from a previous trip's leftovers is how an old vet's number or a discontinued routine ends up in a live pack. Check each master against the dog it describes; in a multi-dog home the classic error is two packs with the same photograph and different names, discovered by a carer at the worst possible moment.
The friend's copy for the dog at home
Your friend is providing home care, so their copy leans towards daily life: how much food and when, walk habits and lead behaviour, house rules, settling at night, what to do if the dog is unwell and who can authorise vet treatment while you are away. Include the vaccination record and health notes, but the emphasis differs from the kennel pack — the friend needs to live the routine correctly for days at a time. Add the practical geography too: where the food is kept in your home if the dog is being visited there, or what arrives with the dog if she is moving into your friend's house.
The kennel's copy for the boarded dogs
A kennel works to its own requirements, so build its pack around them: current vaccination certificates including rabies for each boarded dog, your contact details for the trip, your vet's information, feeding instructions in the measures the kennel can follow, and clear notes on anything staff must know — a dog who cannot be exercised with others, one who guards toys, one who needs a calmer kennel position. Send copies the kennel can keep on file rather than originals you need back, and confirm before drop-off day that the certificates you are sending satisfy the kennel's current rules, not the rules from your last stay.
Originals, returns and the debrief
Keep every original at home in one place and tell your emergency contact where it is, so a third complete set effectively exists if either carer loses theirs. When you return, collect the copies or ask for them to be destroyed if they carry sensitive details, and note anything the carers report — a meal refused, a walk that went badly, a kennel observation about a cough — into each dog's master file while it is fresh. That debrief is what turns this trip's duplication from a one-off effort into the starting point for the next one.
Done this way, each carer holds everything for their dogs and nothing they do not need, and a KinsLe Care Pass for your friend adds temporary, clear access to the home-stay dog's routine and key details while you are away.