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Objective:  to compare the biomarkers and the allostatic load levels in a sample of older persons with and without canine companionship.Method:  descriptive and comparative study. Data were collected using a sociodemographic questionnaire and a fasting blood sample. The allostatic load comprised 11 biomarkers that are primary and secondary stress mediators, which arise from the following systems: neuroendocrine, immune, metabolic, cardiovascular and anthropometric.Results:  a significant difference was found in two biomarkers: cortisol ( t=  -3.091,  df =104,  p= 0.003) and total cholesterol ( t=  -2.566,  df =104,  p= 0.012), in the allostatic load levels between older adults with and without a canine companionship ( U=  1714.00, Z= 2.01,  p= 0.044). By associating the allostatic load level with the canine companionship, there was a higher frequency of older adults with low allostatic load among those who have canine companion, compared with those who do not have canine companionship. (χ 2 = 3.69,  df =1,  p=  0.043).Conclusion:  canine companionship influences health in a positive way, as the allostatic load is lower in older adults who have a dog as companion, in addition to presenting lower levels of cortisol and total cholesterol.

Allostatic load and canine companionship: a comparative study using biomarkers in older adults