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orthopaedic diseases using computer-assisted ration-analysisThe present study is concerned with the examination of 132 dogs presented for skeletal disease treatment in the pet clinic of the Free University of Berlin and the veterinary clinic Dr. H. Grußendorf, Bramsche-Pente, between 1st January 1998 and 1 st July 1999. Patients suffered from Ostocondrosis dissecans, Enostosis, fractured proc. coronoideus, hypertrophic osteodystrophy, axial deviation, hip dysplasia and isolated proc. anconaeus.German Shepherds (n = 25), Rottweiler (n = 12), Bernese mountain dogs (n = 10), Golden Retrievers (n = 10), Hovawarts (n = 9), and Labradors (n = 8) were the most affected pedigrees. The animals age varied from 3 o 12 months. 75,8% of the patients were male.The composition of the feeding-ration was ascertained and analysis was made with the computer-programmes Excel and Diet-check.Actual weight development varied from 67% to 13 1 % of recommended weight development (median 101%). The average energy supply came to 101% of recommendation, varying from 52% to189%. The median of protein supply amounted to 120% of recommendation with a minimum of 58% and a maximum of 294%. Calcium values amounted to 132% in average, varying from 4% to 437%. The content of phosphorus varied from 22% to 346% with a median of 180%. Calcium-phosphorus-ratio varied from 0,37:1 to 3,24:1. The median was 1,28:1.Especially dogs that were fed supplementary diets to their complete commercial feeds showed an excess of calcium. Dogs that were mainly fed on home made diets were rarely provided with adequate calcium.