I assume you have already organised the vacinations, import licence etc. Also that the dog will be travelling as checked-in baggage, rather than cargo or cabin. We have done this to Europe and back with no problems. Do not traquilise the dog. Do not leave toys or ropes etc in the kennel. We put a water container in the freezer and fixed it to the inside of the travel kennel, that way it was ice at the start of the trip, does not easily spill but provides it with a drink as it melts. At Doha airport they bring the dog to the out-size baggage area, to the extreme right of the baggage reclaim area, you can go and wait there and ask about the dog. Just walk out through the green channel. Like I said, there was no problem, dog was fine, many people do it.