Humans live with and depend on animals in various ways. Animals are not only of immense importance as food providers but also as companions for families or lonely individuals. However, the health of animals is threatened by parasites, the number of which is constantly increasing, especially during times of globalization with the transport of goods, plants, and animals from one end of the world to the other. Many parasites of domestic, farm, and companion animals can also infect humans and cause potentially life-threatening diseases known as zoonoses. Therefore, it is essential to continuously update knowledge about the transmission routes of such parasites as well as preventive and control measures to protect both humans and animals. This book presents the most important parasites of dogs, cats, ruminants, horses, pigs, rabbits, rodents, and poultry.