The Croatia Airlines pet policy is as follows:
Only cats and dogs (accompanying a passenger) can be transported in the passenger cabin.
The maximum weight of the bag with the pet is 8 kg.
Animals that cannot be transported in the passenger cabin due to their size, are to be transported in the baggage compartment if certain conditions are met.
Transportation of animals in the baggage compartment, in container size up to 125x75x85 cm is possible only in the Airbus A-319 and Airbus A-320.
Croatia Airlines does not transport animals on flights from Croatia to the UK and Ireland but on flights from UK and Ireland to Croatia Croatia Airlines does transport animals.
Brachycepahlic animals (dogs and cats with very short nose) can not be transported in cargo holds on flights operated by Croatia Airlines. They can be accepted only in passenger cabin, provided they meet requirements (weight with the cage up to 8 kg, max dimensions of the cage 45x35x25cm).
Taking a pet to a foreign country involves preparation and planning far in advance of your departure date. Requirements for pet travel to a foreign country are set by the destination country. If you are you traveling to another country and bringing along your pet you’ll need to meet the animal health requirements of the country you are visiting.
More information on the Croatia Airlines pet policy