We took our Pomeranian mix on a 3 month trip to the USVI. The flight was very stressful for him and for us. The A/C on the plane didn’t work well, he was hot, and if they aren’t service dogs, you’re supposed to leave them in their carrier for the entire flight. Miserable for all of us.
We were glad we had him with us because it was such a long trip, but he did have adjustment problems. We had him at the vet 3 times in the first few weeks. Not good.
We just returned from a six week trip to Greece and did not take him with us. Left him with a pet sitter who has kept him many times. For a trip where you’ll want to do a lot of sightseeing or other activities away from your hotel, I don’t think it’s a good idea to take the dogs. They’ll be unhappy left alone in unfamiliar surroundings, and your schedule will be disrupted by having to rush back to the room to take them out.
If you don’t have a good sitter already, rover.com is a great option.