Your Dog has to be vaccinated against rabies 10 days prior to its arrival into India. You must carry the health booklet which shows that it has been vaccinated against Rabies, Distemper, Parvo Virus, Carona Virus and Leptospirosis. Your Vet should certify the dog free from these diseases. On arrival in Delhi, you need this Health Booklet and the Baggage Tag under which your Dog was booked on your flight. There is no Customs duty involved if the Dog is travelling with you as your Pet on the same flight. The NOC is required only if the Dog is shipped unaccompanied as Cargo.