Note: If you are on a short trip and returning to Great Britain within five days of departure with your dog(s), it is important to have your return tapeworm treatment performed by a veterinary surgeon before leaving Great Britain. This is because before returning to Great Britain, dogs (but not cats or ferrets) must be treated for tapeworms not less than 24 hours and not more than 120 hours (five days) before the time of entry, unless they are entering GB from Northern Ireland, the Republic of Ireland, Finland, Malta, or Norway.