A 10-year-old, male, neutered Irish Terrier dog, weighing 16.2 kg, was presented for further investigation of unilateral nasal discharge of 6-month duration. The patient was on long-term treatment with prednisolone. Computed tomography of the head showed severe chronic erosive rhinitis and severe periodontal disease. On anterograde rhinoscopy, multiple plaque-like lesions were identified throughout the nasal cavity with evidence of severe turbinate destruction. Cytology, histopathology and fungal culture of these lesions confirmed fungal rhinitis attributable to Scedosporium apiospermum infection. A possible causal relationship between periodontal disease and fungal rhinitis remains unknown. To the authors' knowledge, this is the first reported case of fungal rhinitis caused by this particular agent in the United Kingdom.