Canine mammary tumor is an important concern among both owners and veterinarians. Though frequency of mammary tumors varies in different species, canines are the most frequently affected ones, with prevalence about 3 times higher than humans. The book presents information on different types of canine mammary tumors and their features, symptoms, their predisposing factors and molecular marker-based diagnosis and prognosis of tumors. It also highlights many other advanced diagnostic techniques and current trends in therapeutics and surgery for their efficient clinical management. The work lays emphasis on the importance of immunotherapeutics and upcoming and improved vaccines to cure these tumors. It will be useful for veterinary clinicians, students and researchers for their overall awareness.