It is mandatory always to check with the airline on the arrangements or restrictions in relation to transporting animals on board.

Transport in cabin
Animals must be transported in containers (kennels) sufficiently rigid to prevent them from being crushed or from escaping.

Health documents
In addition it is also necessary to check if any health certificates and/or quarantine is required in the country of destination
For further information on regulations on the transport of animals in some EU countries please see the links below: