Objective- A preliminary study of hip dysplasia incidence in large breed dogs Design- Descriptive study Animals- 36 dogs in different breeds Procedures- All of the dogs were examined for Hip dysplasia using Standard ventrodorsal hip extended view, and graded into five categories (A, B, C, D and E) based on the FCI scoring system. Before radiographic examination clinical examination was performed. The Ortolani method was done to evaluate hip joint laxity. Results- Hip dysplasia was found in 72.2% of the dogs, which included 11.1% unilateral and 61.1% bilateral. 73% of the positive cases were male. In respect to clinical sign related to hip joint, 14 and 22 dogs were positive and negative, respectively. Hip dysplasia was diagnosed radiographically in 11 and 15 dogs with or without clinical sign, respectively. Ortolani test represented false negative in 33 cases and false positive in 6 cases. Conclusion and Clinical Relevance- Presence of clinical signs and the results of the ortolani test is not a sensitive indicator for diagnosis of the hip dysplasia. Radiological evaluation of hip joint is essential in susceptible breeds for diagnosis of hip dysplasia. High percentage of the large breed dogs with dysplastic hip joint is the important issue and screening program is necessary for detecting hip dysplasia in large breed dogs.

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