The two diseases boarders are checking for
Rabbit boarders who ask for vaccination proof are almost always checking cover against myxomatosis and rabbit viral haemorrhagic disease, including the newer variant strain where the vaccine used covers it. Both diseases spread readily where rabbits from different households are housed near each other, which is exactly a boarding setting. A responsible boarder protects every guest by refusing unvaccinated rabbits, so being asked is a good sign about the establishment, not an insult. Expect the question at enquiry stage rather than on arrival, because a lapsed booster cannot be fixed the day before a holiday.
What counts as proof in practice
The document boarders recognise is the vaccination card your vet stamps and dates at each appointment, showing your rabbit's name and description, the vaccine used, and the date given and due again. A printed history from the practice, or a clear photo or scan of that card, satisfies many boarders for booking, with the original card travelling with the rabbit at drop-off. A verbal assurance that your rabbit is 'up to date' is rarely enough, and a receipt alone can be ambiguous about which rabbit and which disease it covered. Keep the card flat and legible — faded ink on a chewed card causes avoidable arguments.
Timing rules that catch owners out
Boarders commonly require the booster to be current for the whole stay, not just the drop-off date, and some set a minimum gap between a first vaccination and boarding so immunity has time to develop. If your rabbit's booster falls due during the boarding dates, vaccinate before the stay and tell the boarder the new date rather than hoping it goes unnoticed. Newly adopted rabbits with unknown histories are the other common problem: a boarder may ask for a vet visit and a completed course before confirming. Ask about these rules when you first enquire, in the same conversation as hutches, hay, and drop-off times.
Extras some boarders ask about
Beyond vaccinations, some boarders ask whether your rabbit has been treated for fleas, whether bonded pairs are boarded together, and whether there have been recent signs of illness such as sneezing, loose droppings, or weight loss. A few want an emergency vet authorisation signed in advance. None of this means your rabbit needs extra vaccinations invented for boarding — if a boarder requests something you have never heard of, check with your own vet before agreeing. Honest answers protect your rabbit too, because a boarder who knows about a delicate stomach or a tooth problem will watch for the right things.
Getting the paperwork ready before you book
Put the vaccination card, your vet's contact details, and any health notes in one place as soon as you start looking at boarders, and photograph the card so a copy survives even if the original is mislaid. Recheck the due date against your holiday dates with fresh eyes — boosters are easy to let slip by a month. Keeping that card, those dates, and your vet's details together in a KinsLe Pet Passport gives you a single packet you can show a boarder, a new vet, or a sitter without hunting through drawers each time.