Objectives: Peritonitis is a common complication in peritoneal dialysis patients. The causative agents vary from commonly encountered pathogens to more unique species. This manuscript reports a rare case of peritonitis caused by Pantoea agglomerans in a patient on peritoneal dialysis with a history of close contact with a pet dog. While a few cases of peritonitis related to pet animals have been reported in the literature, awareness and knowledge are limited. This article seeks to enhance our knowledge of this rare ailment and underscore the significance of recognizing risks related to pet ownership. Methods: We conducted an analysis of data derived from diagnosing and treating patients in a clinical setting, supplemented by a comprehensive review of previously reported findings. Results: A 76-year-old female, who was receiving peritoneal dialysis, presented with intense abdominal pain. Clinical examination revealed abdominal tenderness, rebound tenderness, and abdominal rigidity. The diagnosis of bacterial peritonitis was established based on the patient's symptoms and analysis of peritoneal fluid. The analysis confirmed the presence of P. agglomerans, an unusual culprit. Upon investigation, it was uncovered that the patient had close contact with a pet dog, suggesting a potential link between the infection and the dog. Conclusions: This case highlights the crucial awareness that physicians need to have regarding the potential risk of peritonitis associated with pet dogs in patients undergoing peritoneal dialysis. To this end, it is recommended that a patient's medical history include inquiries about pet ownership and proximity to dogs. This approach would facilitate appropriate education and the implementation of preventive measures.