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Introduction: Diabetes mellitus is caused by an increase in blood glucose levels, a phenomenon mediated by environmental and genetic factors. This increase in blood glucose levels may be due to a partial or absolute failure to produce insulin as well as a loss in tissue sensitivity to insulin. Given that diabetic patients respond only to insulin therapy and are mostly thin, canines can develop insulin resistance, without developing glucose intolerance or diabetes. Aims: We aim to evaluate insulin resistance using the mathematical model homeostatic model assessment (HOMA) in patients with different body condition. Insulin levels were determined using the IRMA assay, and X2 test and analysis of variance (ANOVA) were used for the statistical analysis. Results: ANOVA between the groups showed no significant differences between the normoglycemic HOMA group of the obese and normal weight patients and between the diabetic and normal weight HOMA group. The X2 correlation index did not show a significant association between the body condition and the altered HOMA index (X2 = 3.056, p = 0.08). Insulin levels were higher in obese patients than in those with normal weight, although the difference was not significant (F = 1.004, p = 0.394). Conclusion: In addition, there were no significant differences in HOMA levels associated with increases in the body condition, which could be related with a higher state of insulin deficiency over the state of insulin resistance.
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