Hello, I publish Fido Friendly, the Travel & Lifestyle magazine for you and your dog. Have you gone to the Lufthansia website? I found this information for you from the following website:

http://www.seatguru.com/airlines/Lufthansa/pets.php

Pets that meet the following qualifications can travel in the passenger cabin:

• Only domesticated dogs and cats are allowed.
• Your pet can comfortably remain in its kennel, under the seat for the entire flight.
• The maximum weight of animal and kennel is 18 lb/8 kg and may be a maximum of 55cm X 40cm X 20cm or 22in x 16in x 8in.
• The kennel is specifically made for animal carriage and can fit under the seat.
• Your pet has all necessary health documents required by your destination