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The goal of this study was to analysed and compared the nutrients content of dry dog foods with nutrient content, which is declared by the manufacturer of the dry dog foods. 15 dry dog foods bought in the Slovak republic were analysed for dry matter, crude protein, crude fat, crude fiber, nitrogen free extract and ash concentration. Nutrients analysis of dry dog foods were realised in Laboratory of Quality and Nutritional Value of Feeds. We found, that only 6 from 15 dry dog food samples were in interval ±5 % from declared crude protein concentration; no sample was in interval ±5 % from declared crude fat concentration; only 2 from 15 dry dog food samples were in interval ±5 % from declared crude fiber concentration; only 4 from 15 dry dog food samples were in interval ±5 % from declared ash concentration. Analysed dry dog food samples have very different nutritive value in comparison to declared nutritive value on bale. The highest shortage was detected by the fat concentration. The highest excess was detected by the fiber concentration.