Husband and I flew Lufthansa business end November via Frankfurt with 2 cats in cabin. Each in own carrier under 8 kg each. Dmm to Den. They were very strict leaving Ksa but great in Fra. No problems going into the lounge with them and the crew were fantastic with them. Transiting Fra you are taken to a private room to screen the carriers. And again those staff were amazing. Highly recommend Lufthansa if you have pets.