Portugal, Spain France, the UK and other Countries now have strict 40 day quarantine for dogs. They will take them away from you at Customs.
If the dog's origin is not the EU you can't bring them without the 40 day quarantine, physically 40 days or more as per the Vet. In England its 40 days no matter where the dog originates from.
Also, dogs to enter the EU need all kinds of papers, etc.. children just need a passport. I have both, and only cruise with the children...believe me...