This is a work of B.V. Sc & A. H. which encompass the gastro-intestinal helminth parasites of dogs. It gives brief note on morphology, epidemiology, clinical signs and symptoms, diagnosis, prevention and treatment. This dissertation comprises the parasites of dogs that are evident in the Kathmandu Valley, Nepal with the clear images of eggs of parasites. Besides, it contains meet suggestions and recommendations for the control of prevailing parasites. Thus, this dissertation may serve as a valuable reference for veterinary students.