First aid is defined as the immediate treatment of injured animals or those suffering from sudden illness, with a view to preventing worsening of disease or death. Although veterinary nurses do not have greater legal powers than lay people, in situations requiring first aid they will have far greater knowledge of anatomy and physiology, and of the specific emergency first aid techniques required. In practice, nurses may be faced with emergency situations requiring evaluation and stabilization until the arrival of the veterinary surgeon. This chapter is designed to give information on the Definition of the term first aid and its limitations; Reasons for patient evaluation; Obtaining good case history and what should be included; Emergency procedures that may be performed to maintain life; Basic resuscitation techniques; and Emergency procedures for common first aid situations.