Aww how old is she? I'm sure she'll be fine and at least you'll be able to cuddle her while she has her vaccinations. You can get them to do 2 vaccinations before the blood test if you are worried rather than having to pay out twice for blood tests. Just make sure you allow plenty of time to get everything done before you need the passport to be valid (blood tests can take a while to get the results of).
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Korky is 14 years old which is why I am so worried about having it done. We spend the summers in France and at the moment he stays home with my mum who has lived with us since before we got Korky so I would like that situation to continue. However, without boring you with too much detail, she is in her nineties and I feel I ought to have a fall back situation. We wouldn't need his passport to be valid until we were coming back into the UK but obviously we wouldn't take him out of the country until we knew his blood results were OK