| Summary: | Several studies on the interaction between gut microbiota and diets, including prebiotics, have been reported in dogs, but no data are available about the effects of dietary administration of grape proanthocyanidins. In the study, 24 healthy adult dogs of different breeds were recruited and divided in 3 groups of 8 subjects each. A group was fed with a control diet (D0), whilst the others were supplemented with 1 (D1) or 3 (D3) mg/kg live weight of grape proanthocyanidins. Samples of feces were collected at the beginning and after 14 and 28 days for microbiota, short chain fatty acid, and lactic acid analysis. Serotonin and cortisol were measured in saliva, collected at the beginning of the study and after 28 days. A significantly higher abundance (<i>p</i> < 0.01) of <i>Enterococcus</i> and <i>Adlercreutzia</i> were observed in D0, whilst <i>Escherichia</i> and <i>Eubacterium</i> were higher in D1. <i>Fusobacterium</i> and <i>Phascolarctobacterium</i> were higher (<i>p</i> < 0.01) in D3. Salivary serotonin increased (<i>p</i> < 0.01) at T28 for D1 and D3 groups but cortisol did not vary. Proanthocyanidins administration influenced the fecal microbiota and neuroendocrine response of dogs, but a high variability of taxa was observed, suggesting a uniqueness and stability of fecal microbiota related to the individual.
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