The Ethiopian Airlines pet policy is as follows:
Pets (cats and dogs) are accepted in the cabin on all Ethiopian Q-400 aircrafts.
Q-400 Aircraft pets in containers accompanied by passenger or shipped as cargo may be carried in the baggage compartment(s).
Dogs and cats are accepted in the cabin with limited number per compartment (2 in Economy class and 1 in business class) with a box measuring dimensions not more than 55X40X20cms and does not exceed 8kgs including transport container.
Dogs and cats contained in boxes larger than 55X40X20cms dimension, shall not be accepted in cabin and therefore shall be loaded in belly.
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 Ethiopian Airlines pet policy