Histopathologic patterns of nontumoric cutaneous lesions in dogs referred to Veterinary Hospital of Ahvaz

The aim of this study is inspection of histopathologic patterns in skin lesions of referred dogs to Veterinary Hospital of Shahid Chamran University. This study carried out on 40 cases. After complete macroscopic examination and sedation, sampling was carried out and Haematoxylin and Eosin stained slides were prepared. In macroscopic examination all cases had alopecia and hypotrichosis and 30 (75%) cases had focal alopecia and 10 (25%) had diffuse alopecia. Seventeen cases (42.5%) had seborrhea and 19 (47.5%) had scale and wound. Microscopic examination revealed perivascular dermatitis pattern in 16 (40%) and 12 cases had chronic perivascular dermatitis. Nodular and diffuse dermatitis were seen in 1 and 5 respectively (15%). In two cases of diffuse dermatitis, mite sections were observed. Atrophic dermatitis was detected in 15 cases (37.5%). Perifolliculitis were seen in 18 (45%) and folliculitis were seen in 7 cases (17.5%) and 5 were luminal and 2 were luminal and mural. Furunculosis was seen in one dog (2.5%). Fibrosing dermatitis was detected in 2 (5%) samples. Vasculitis was seen in one dog (2.5%). In this study perivascular dermatitis had the most frequency and it may be due to different agents. Atrophic dermatoses are in second rank and malnutrition is first candidate cause. This study is the first attempt in the field of dermatopathology and the results of present research revealed different type of microscopic patterns.