It is now an established fact that laboratory animals play a very vital role in bio-chemical research particularly in the drug development programmes. The book has been authored in accordance with the syllabi prescribed by veterinary council of India VCI, New Delhi for under graduate students of veterinary science and animal husbandry all over India. The book Includes comprehensive and updated information on all the topics, which is presented in a precise manner in a simple language, which becomes easy for students to understand. Further, with the touch of personal communication of authors out of their enriched experience in profession, for considerable long time, the information becomes more educative and lucrative for students as well as for the teacheThe book contains information on pet animals and animal welfare and ethics.