This work comprehensively compiles current studies in veterinary obstetrics and gynecology. It covers diverse topics including repeat breeder syndrome in cows, reproductive physiology of rabbits, viral mastitis in cattle, the role of kisspeptins in small ruminant reproduction, prostatic diseases in dogs, the impact of heat stress on dairy cow fertility, and Apgar scoring in newborn cats and dogs. Repeat breeder syndrome, characterized by cows with normal estrous cycles failing to conceive, is presented as a multifactorial complex problem with diagnostic and treatment approaches based on scientific research. Rabbit reproductive anatomy, hormonal cycles, and common reproductive diseases are elaborated, and the importance of viral agents in mastitis pathogenesis along with diagnostic aspects of viral mastitis are detailed. Kisspeptins are introduced as neuropeptides regulating GnRH and gonadotropin secretion in small ruminants, with synthetic analog applications summarized. Canine prostatic diseases including benign prostatic hyperplasia, cysts, squamous metaplasia, prostatitis, abscesses, and neoplasia are defined alongside diagnostic and treatment strategies. Heat stress in dairy cows is evaluated as a critical factor negatively affecting fertility via metabolic, hormonal, and reproductive disruptions, with discussions on thermoregulation, cortisol increase, and disease susceptibility. The neonatal section includes the Apgar score for assessing health in kitten and puppy births, outlines the neonatal triad, and common life-threatening conditions, emphasizing the critical importance of early health assessments. Serving veterinary students, clinicians, and researchers, the book offers a detailed, evidence-based resource integrating theoretical and practical knowledge.