This entries in this dictionary define and describe bacteria, viruses, carriers and disease for a wide range of livestock and domestic pets. It includes causes, diagnosis, signs and treatment (including first aid) and, where necessary, points out the variations in the nature of the same disease when it occurs in different animals and takes account of international scientific research osservations and findings. In this 18th edition, the range of animals and topics has been widened to embrace recent legislation and subjects such as equine motor neurone disease, predetermining the sex of calves, and tarantulas as domestic pets.