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We present the first reported case of peritoneal dialysis-associated peritonitis caused by Staphylococcus pseudintermedius, an organism that had been misclassified as S. aureus in the past. S. pseudintermedius is well recognized in the veterinary literature and noted as flora in the mouth, nares, and anus of domesticated animals. It has been associated with soft tissue infections in pets and is now being reported in increased frequency as the causative agent in various human infections. It also has a different antibiotic sensitivity profile. The patient had close contact with her pet dog and was successfully treated with intravenous antibiotics in the hospital followed by oral doxycycline for 10 days after discharge. The patient has not had any recurrent infection after obtaining and applying appropriate hygienic education and precautions.