Yathiraj, S.Uppendra, H. A.Ansar Kamaran, C.Satyanarayana, M.L.Ranganath, L.Lalhmingmuana, Sailo--2017-11-032017-11-032010-07-17----http://krishikosh.egranth.ac.in/handle/1/5810034641P.G. ThesisThis study was undertaken to primarily assess duodenal disorders in dogs and to identify biochemical and histopathological changes. Duodenal disorders were assessed based on endoscopic evaluation and were classified. The incidence of duodenal disorders from the total number of cases and gastrointestinal manifestation were 0.17 per cent 0.92 per cent respectively. Duodenoscopy was performed in 15 dogs under general anesthesia. No hematological or biochemical changes could be attributed to duodenal disorders. Among 15 dogs presented for Duodenoscopy, the breeds included were Mongrel (40%), Labrador Retriever (40%), German Shepherd (6.67%), Dalmatian (6.67%) and Boxer (6.67%). The agegroup distribution of dogs were >6 months - 1 year (6.67%), >1-4 years (66.67%), >4-8 years (13.33%), and >8-12 years (13.33%). Males constituted 73.33% and females 26.67%. The endoscopic evaluation of duodenum revealed Duodenoscopic examination revealed no gross abnormality in 8 of 15 (53.33 %), mucosal ulceration and erosion in 2 of 15 (13.33 %), mucosal congestion and hemorrhage in 4 of 15 (26.67 %), and small polyp or mass in 1 of 12 (6.67 %) of cases. Adequate biopsy material could be collected in 12 of 13 (92.31%), of these 12 (92.31%); the histopathological diagnosis included 4 of 12 (33.33 %) did not show any histological abnormalities, 7 of 12 (58.33 %) had non-specific enteritis and 1 of 12 (8.33 %) had hyperplasia. Duodenoscopy is a minimally invasive technique and can be considered as an invaluable procedure while detecting disorders primarily of the duodenum.ennull----Thesis