Dogs were used by the early age people for various important purposes before being domesticated. They perform many roles for people, such as–hunting, herding, pulling loads, protection, assisting police and military, companionship and more recently, aiding handicapped individuals. However, dogs are also a source of meat in many countries like–Korea. In this modern world dogs are not just pets but they are treated like members of the family. As pets have a close bond with human, there is a major risk of health hazard. Dogs harbor a number of infective stages of disease causative agents transmissible to man. They become infected with an internal or external parasite at some point in its lifetime. Parasites can affect the pets in a variety of ways, ranging from simple irritation to causing life-threatening conditions if left untreated. Some parasites can even infect and transmit diseases to human. To date, domestic animals represent an important source of zoonotic diseases. A zoonotic disease is a disease that can be passed between animals and humans. Household pets play a direct role in transmitting zoonosis.