You don't need to use a vet in Calais - we did for the first few trips and never since.
We found the best thing to do [ as we didn't like staying in the Clais area ] was to book a vet at a town like Soissons - fantastic Municipal Site and a good vet there - all we had to do was tell them what time the ferry was - and hey presto the appointment was made .
Costs do seem to vary a lot - so beware of that - sometimes even in the same Vet Practice.
We have found that many vets have excellent English - and indeed some have studied over in the UK too.
Frankly I would not bother making the appointment at this end - just go and visit on your first day over there and have a look at Practices.
We always caused laughter as our dog pulled us INTO the vet's surgery - they said he was a good advert
