I notice you just joined the Forum yesterday. Hope you will stay on it once you move to wherever in Europe. Enjoy
Also, take notice of what Phoenix said about measuring your dog and getting the correct size box. I have taken/collected dogs to and from the airports and it is amazing at how small some boxes are, yet the owners claim to love their pets.
Your dog should be able to lie down comfortably and be able to turn around once inside the box with minimum effort. Do not forget that the dog will not just be in the box for the duration of the flight (4 to 5 hours depending on your destination) but also while he/she goes through customs control too and like any other passenger the animals have to be at the airport the 2/3 hours prior to the flight too! There could be a lot of time sitting on the tarmac and all that time couped up can stress some dogs.
Some airlines do not allow anything in the box with the dog other than the blanket (no toys, bowls, biscuits, leashes etc) so it is always a good idea to place an old t-shirt of yours in for the dog to smell, recognise and feel more 'at home'. Water is fed through a water tube from the outside of the box. Take a fresh bottle to refill just before the customs take over!!
Do not have to remind you to make sure your dog's passport is all up to date as well as the vaccinations - especially rabies!!
Bubbles x