For dogs, you will need to take them to a vet in the EU between 1 and 5 days (24 and 120 hours) before you are due to arrive back in the UK, for the vet to administer tapeworm treatment and record this in the AHC. You will be asked to show the AHC (with the tapeworm treatment recorded) at the border when you arrive back in the UK. The above does not apply for dogs travelling back directly from Ireland, Northern Ireland, Finland, Norway or Malta as the dog will have already had tapeworm treatment before going out. For cats or ferrets, there are no additional requirements to come back to the UK. You will just need to show the Animal Health Certificate at the border when you return.