If it's in the EU but not the UK you generally need to have the cat vaccinated against Rabies and a blood test certificate to show that the cat has antibodies to Rabies. Most airports accept them as accompanied baggage, cutting the cost by at least half. You need an export licence from Qatar and an EU import form, easy to download and get a vet here to sign. Pretty much hassle free, QPR and Doha Vets can advise you more. JJ